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#!/bin/bash
# Fast backup using rsync
if [ $# -ne 2 ]; then
echo "Usage: $(basename "$0") /dev/sdX backup"
exit 1
fi
if [ "$(id -u)" -ne 0 ]; then
echo "This script must be run as root."
exit 1
fi
rsync_options="-auvP --delete"
device=$1
name=$2
# Note: `name` (nor `device`) should not contain spaces
cryptsetup open --type luks $device $name
if [ $? -ne 0 ]; then
# bad device
exit 1
fi
mount /dev/mapper/$name /mnt/$name
# TODO: stop backing up /var. Backup is just for Postgres and Mediawiki.
# `/var` is used by too many applications. Specialy pacman that clutters it
# with cached binaries.
rsync $rsync_options /var /mnt/$name # <10G
rsync $rsync_options /home /mnt/$name # <900G
rsync $rsync_options /etc /mnt/$name # <20M
echo "Backup complete."
df -h
umount /mnt/$name
cryptsetup close $name
echo "All done. Check \`$ lsblk\` before unplugging the storage device."
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