#!/bin/sh

previous_snapshot=$(zfs list -t snapshot -H -o name -r Datenspeicher | sort | tail -n2 | head -n1)
current_snapshot=$(zfs list -t snapshot -H -o name -r Datenspeicher | sort | tail -n1)

echo "PREV: $previous_snapshot"
echo "CUR: $current_snapshot"

file_name=$(echo "$current_snapshot" | cut -f2 -d"/")

cd /mnt/Datenspeicher/snap-backup-dataset/temporary-backups/

zfs send -I $previous_snapshot $current_snapshot | gzip > $file_name.gz

scp -i ../backup_key $file_name.gz zfs_snap_backup@etha.cpi.imtek.uni-freiburg.de:~/zfs-backups/ && rm $file_name.gz

# Restoring Backups:
#
#   cd /mnt/Datenspeicher/snap-backup-dataset/temporary-backups/
#   scp -i ../backup_key zfs_snap_backup@etha.cpi.imtek.uni-freiburg.de:~/zfs-backups/<backup-file> tmp-backup-file.gz
#   gunzip -c tmep-backup-file.gz | zfs receive -F Datenspeicher/test-backup
#   rm tmp-backup-file.gz