Backup script usint btrfs

script

#!/bin/bash

TIMESTAMP=$(date +%F_%R)
OLD_TIMESTAMP="$1"

echo "new timestamp is $TIMESTAMP"
echo "old time is $OLD_TIMESTAMP"

if [ -z "$OLD_TIMESTAMP" ]
then
      read -p "No arguments given, continue? " -n 1 -r
      echo    # (optional) move to a new line
      if [[ ! $REPLY =~ ^[Yy]$ ]]
      then
          [[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1 # handle exits from shell or function but don't exit interactive shell
      fi
fi

if grep -qs '/mnt/backups ' /proc/mounts; then
    echo "/mnt/backups mounted already"
else
    echo "mounting /mnt/backups"
    mount /mnt/backups
fi

if grep -qs '/mnt/sdcard-backups ' /proc/mounts; then
    echo "/mnt/sdcard-backups mounted already"
else
    echo "mounting /mnt/sdcard-backups"
    mount /mnt/sdcard-backups
fi

echo "doing stuff"

#mount /mnt/backups
#mount /mnt/sdcard-backups

#btrfs subvolume create /mnt/backups/$TIMESTAMP
mkdir /mnt/backups/$TIMESTAMP
mkdir /mnt/sdcard-backups/$TIMESTAMP

btrfs subvolume snapshot -r / /mnt/backups/$TIMESTAMP/root
btrfs subvolume snapshot -r /etc /mnt/backups/$TIMESTAMP/etc
btrfs subvolume snapshot -r /home /mnt/backups/$TIMESTAMP/home
btrfs subvolume snapshot -r /var /mnt/backups/$TIMESTAMP/var
btrfs subvolume snapshot -r /var/cache /mnt/backups/$TIMESTAMP/var-cache
btrfs subvolume snapshot -r /var/lib/machines /mnt/backups/$TIMESTAMP/var-lib-machines
btrfs subvolume snapshot -r /var/lib/portables /mnt/backups/$TIMESTAMP/var-lib-portables

if [ -z "$OLD_TIMESTAMP" ]
then
    btrfs send /mnt/backups/$TIMESTAMP/root | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send /mnt/backups/$TIMESTAMP/etc | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send /mnt/backups/$TIMESTAMP/home | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send /mnt/backups/$TIMESTAMP/var | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send /mnt/backups/$TIMESTAMP/var-cache | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send /mnt/backups/$TIMESTAMP/var-lib-machines | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send /mnt/backups/$TIMESTAMP/var-lib-portables | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
else
    btrfs send -p /mnt/backups/$OLD_TIMESTAMP/root /mnt/backups/$TIMESTAMP/root | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send -p /mnt/backups/$OLD_TIMESTAMP/etc /mnt/backups/$TIMESTAMP/etc | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send -p /mnt/backups/$OLD_TIMESTAMP/home /mnt/backups/$TIMESTAMP/home | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send -p /mnt/backups/$OLD_TIMESTAMP/var /mnt/backups/$TIMESTAMP/var | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send -p /mnt/backups/$OLD_TIMESTAMP/var-cache /mnt/backups/$TIMESTAMP/var-cache | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send -p /mnt/backups/$OLD_TIMESTAMP/var-lib-machines /mnt/backups/$TIMESTAMP/var-lib-machines | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
    btrfs send -p /mnt/backups/$OLD_TIMESTAMP/var-lib-portables /mnt/backups/$TIMESTAMP/var-lib-portables | btrfs receive /mnt/sdcard-backups/$TIMESTAMP
fi