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README.md
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README.md
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# A poor man backup
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## Description
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A simple wrapper script to create a safe and redundant backup
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## Requirements
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Requires: bash, GnuPG, duplicity, rdiff-backup, ssh, figlet
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##
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The script attempts 3 differents backup:
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* to a SD card via duplicity, encrypted with gnupg. It prevents ransom-ware.
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* to a remote Pc via duplicity and ssh, encrypted with gnupg. It prevents lost or damage.
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* to a remote Pc with encrypted disk via rdiff-backup. Plain mirror for easy recovering.
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+-------------------------------+ +-------------+
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| HOME | | SD CARD |
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| |---> duplicity |
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| | | encrypted |
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+-------------------------------+ +-------------+
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| |
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| |
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+--v--------------+ +------v-----------+
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| REMOTE SSH PC1 | | REMOTE SSH PC2 |
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| duplicity | | rdiff-backup |
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| encrypted | | plain mirror |
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+-----------------+ +------------------+
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Optional: copies selected config files in $HOME/backups
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It is recommended to do a full backup every now and then, therefore the script ask you for
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a full backup every 6 months, and ask to delete the old full backup every 7 months. Make
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sure you have enough space for 2 full backups in your destination drive. A full backup
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takes time, you better run it before going to sleep
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Important: please remember to backup your gpg-private key separately because you will need
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it to access the encrypted backup.
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The script verifies that gpg-agent is running and mount the SD card, it is supposed to be
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well-commented and intentionally is all manual. In case you wants to automatize you need
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to setup ssh and gpg passwordless and add the script to cron.
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my poor's man backup: hope you find this useful
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To make it yours you need to customize your paths and your shouts
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Good luck and may you never need to recover.
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Comments? Kudos? Vaffa? Advices? Thank you!
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dan [at] autistici.org
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296
poor-man-backup.sh
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296
poor-man-backup.sh
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#!/bin/sh
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# A poor man backup
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# version 0.3
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# A simple wrapper script to create a safe and redundant backup.
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# Requires: bash, GnuPG, duplicity, rdiff-backup, ssh, figlet
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# The script attempts 3 differents backup:
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# To a SD card via duplicity, encrypted with gnupg. It prevents ransom-ware.
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# To a remote Pc via duplicity and ssh, encrypted with gnupg. It prevents lost or damage.
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# To a remote Pc with encrypted disk via rdiff-backup. Plain mirror for easy recovering.
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#
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# +-------------------------------+ +-------------+
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# | HOME | | SD CARD |
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# | |---> duplicity |
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# | | | encrypted |
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# +-------------------------------+ +-------------+
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# | |
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# | |
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# +--v--------------+ +------v-----------+
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# | REMOTE SSH PC1 | | REMOTE SSH PC2 |
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# | duplicity | | rdiff-backup |
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# | encrypted | | plain mirror |
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# +-----------------+ +------------------+
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#
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# Optional: copies selected config files in $HOME/backups
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#
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# It is recommended to do a full backup every now and then, therefore
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# the script ask for a full backup every 6 months, and ask to delete
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# the old full backup every 7 months. Make sure you have enough space
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# for 2 full backups in your destination drive. A full backup takes
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# time, you better allow it before going to sleep
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#
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# Important: please remember to backup your gpg-private key separately
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# because you will need it to access the encrypted backup.
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#
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# The script verifies that gpg-agent is running and mount the SD card,
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# it is supposed to be well-commented and intentionally is all manual.
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# In case you wants to automatize you need ssh and gpg passwordless and
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# add the script to cron.
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#
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# my poor's man backup: hope you find this useful
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# To make it yours you need to customize your paths and your shouts
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# in the section below: VARIABLES
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# Good luck and may you never need to recover.
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#
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# Comments? Kudos? Curses? Advices? Thank you!
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# dan [at] autistici.org
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###############
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# Invariables #
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###############
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# We don't need to change anything here
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USER=`whoami`
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DATE=`date -I` ## only date w/o hours and minutes
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HOST=`hostname`
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#############
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# Variables #
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#############
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# Here you Define your variables:
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# BUINT is where you want to save a copy of your modified config files.
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# BUEXT is your removable memory, perhaps an unmounted SD card.
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# BUREM1 is the first remote file system, non-encrypted. Thus backup goes encrypted there.
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# BUREM2 is the second remote file system, encrypted. Thus backup goes un-encrypted there.
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# BUSSH is the ssh-key
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# BUNO is the exclude list txt file
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# BUGPG is the encrypt and sign-key key-id
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BUINT=$HOME/backups
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BUEXT=/mnt/sd
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BUREM1=zora ## the name of a remote FS as defined in ~/.ssh/config
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BUREM2=zelda ## another
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BUSSH=$HOME/.ssh/id_rsa
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BUNO=$HOME/.exclude
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BUGPG=Key-ID
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###########################################################
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# There should be no need to change anything from now on, #
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# but all that has been written with the goal to be read #
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###########################################################
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#########################
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# Because it looks good #
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#########################
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figlet "backup time"
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echo " "
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date
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echo " "
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########################################
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# Optional: local backup system config #
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########################################
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#########################################################
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# I want to copy those modified config files in my HOME #
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# before to backup the whole $HOME #
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# Here you can name as many as you want. #
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#########################################################
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echo "Salvate i quadri! Copio quei file di sistema"
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echo "Save the paintings! Let's save a copy of those system files"
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# Personally i like the italian echo version and cannot live without
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cat /etc/fstab > $BUINT/$HOST-etc-fstab ;
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cat /etc/hosts > $BUINT/$HOST-etc-hosts ;
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cat /etc/hosts.deny > $BUINT/$HOST-etc-hosts-deny ;
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cat /etc/hosts.allow > $BUINT/$HOST-etc-hosts-allow ;
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cat /etc/motd > $BUINT/$HOST-etc-motd ;
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crontab -l > $BUINT/$HOST-$USER-crontab
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# Keep track of the installed software
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echo "List installed software and copying sources.list"
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dpkg --get-selections | grep -vi kernel > $BUINT/$HOST-dpkg-sw-list.conf ;
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cat /etc/apt/sources.list > $BUINT/$HOST-etc-apt-sources.list ;
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cat /etc/apt/preferences.d/preferences > $BUINT/$HOST-etc-apt-preferences.d-preferences ;
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ls -lhp /usr/local/bin > $BUINT/$HOST-sw-in-usr-local-bin.txt ;
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echo " "
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#################################
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# Check if gpg-agent is running #
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#################################
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echo " "
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echo "calling gpg-agent:"
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gpg-agent
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if ! gpg-agent 2>/dev/null; then
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echo 'Per fare un backup, ci vuole un gpg-agent'
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echo "You need a gpg-agent running"
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echo "Aborting execution - Exit"
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exit 5
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else
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echo " "
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fi
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########################################################################################
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# You can launch gpg-agent with: #
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# eval $(gpg-agent --daemon) #
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# but it should really start at login #
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# On my box i have in ~/config/openbox/autostart #
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# gpg-agent --daemon --enable-ssh-support --write-env-file "${HOME}/.gpg-agent-info" & #
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########################################################################################
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#######################################################################################
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# To be safe from ransonware, I keep my removable backup offline. #
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# the if-statement check the exit code of grep, which indicates if there was a match. #
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# I don't want the output displayed, so i redirect it to /dev/null #
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#######################################################################################
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#####################
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# Mount the SD card #
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#####################
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echo "Calling $BUEXT:"
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if mount | grep $BUEXT > /dev/null; then
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echo "$BUEXT is already mounted and available"
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else
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echo 'Per fare un tavolo, ci vuole un legno..'
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echo 'Per fare un backup, ci vuole una memoria'
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echo 'We need a memory.'
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echo "Mounting $BUEXT:"
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sudo mount $BUEXT
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sleep 2
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fi
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# Verify that external storage is mounted
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if mount | grep $BUEXT > /dev/null; then
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echo " "
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else
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echo "$BUEXT DID NOT MOUNT"
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echo "Aborting execution - Exit"
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echo " "
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exit 5
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fi
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#######################################
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# Encrypted backup on external memory #
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#######################################
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echo "Nessun impedimento. Questo backup s'ha da fare."
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echo "Backup on $BUEXT via duplicity and gpg (y/n)"
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read input
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if [ "$input" = "y" ]; then
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echo " "
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echo "Go go go with first backup. A full one every 6 months"
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echo "Vai col primo backup"
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echo " "
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duplicity --encrypt-sign-key $BUGPG --use-agent --full-if-older-than 6M --exclude-filelist $BUNO $HOME/ file:///$BUEXT/backups
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sleep 1
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echo "Let me erase backups older than 7 month from $BUEXT"
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echo " "
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duplicity remove-all-but-n-full 2 --encrypt-sign-key $BUGPG --force file:///$BUEXT/backups
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echo " "
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else
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echo "(N)o backup on $BUEXT"
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echo " "
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fi
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###########################
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# Umount external storage #
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###########################
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echo "Umount $BUEXT (y/n)"
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read input
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if [ "$input" = "y" ]; then
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sudo umount $BUEXT
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sleep 2
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else
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echo "(N)o, exit and not umounting $BUEXT"
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exit 5
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fi
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################################################
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# Verify that the external memory got umounted #
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################################################
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if mount | grep $BUEXT > /dev/null; then
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echo "$BUEXT DID NOT UMOUNT"
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echo " "
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exit 5
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else
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echo "(Y) Umounted $BUEXT"
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fi
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#################################
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# Check if ssh-agent is running #
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#################################
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if [ -z "$SSH_AUTH_SOCK" ] ; then
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echo "calling ssh-agent"
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eval `ssh-agent` ; ssh-add $BUSSH
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else
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echo " "
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fi
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####################################################
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# Backup with duplicity and GPG on BUREM1 via ssh #
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####################################################
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echo "Signora Ceccarelli ne facciamo un'altra?"
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echo "Backup on $BUREM1 via ssh, duplicity and gpg (y/n)"
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read input
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if [ "$input" = "y" ]; then
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echo " "
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echo "Go go go with second backup. A full one every 6 months"
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echo "Vai col secondo backup"
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echo " "
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duplicity --encrypt-sign-key $BUGPG --use-agent --full-if-older-than 6M --exclude-filelist $BUNO $HOME/ sftp://$USER@$BUREM1//home/$USER/backups
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sleep 1
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echo "Let me erase backups older than 7 month from $BUREM1"
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echo " "
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duplicity remove-all-but-n-full 1 --encrypt-sign-key $BUGPG --force sftp://$USER@$BUREM1//home/$USER/backups
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else
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echo "(N)o backup su $BUREM1"
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echo " "
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fi
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########################################################################
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# Backup unencrypted with rdiff-backup on BUREM2 (encrypted hard disk) #
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########################################################################
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echo " "
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echo "Signora Ceccarelli!"
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echo "Andiamo su non faccia la manfrina, ne facciamo un'altra."
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echo "Backup plain mirror on $BUREM2 with rdiff-backup via ssh (y/n)"
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read input
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if [ "$input" = "y" ]; then
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echo " "
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echo "Go go go with third backup"
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echo "Vai col terzo backup"
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rdiff-backup --exclude-filelist $BUNO $HOME/ $BUREM2::/home/$USER/backup/$USER
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echo " "
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echo "Let me erase backups older than 1 year from $BUREM2"
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rdiff-backup --remove-older-than 52W $BUREM2::/home/$USER/backup/$USER
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echo " "
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echo "So Long, and Thanks for All the Fish"
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echo " "
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else
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echo "(N)o backup on $BUREM2"
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echo " "
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exit 5
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fi
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