Backup verification script

simple_backup_verification_procedure.sh

# lets say you are backing up to external media like a usb hardisk drive. once in a while, you should restore the backup to an alternate location and verify and validate the restorability and fidelity of the backup.
# Following a mass file restore from backup to alternate location, perform comparison with original to confirm the backup is good and restorable

#On test restore host:
# zpool create -f tank /dev/sdb
# zpool list
mount /dev/sdc1 /mnt/bup/  #where sdc1 is the device for the external usb hdd you just plugged in
ls /mnt/bup
ls /mnt/bup/originhostname/
ls -lFh /mnt/bup/originhostname/originhostname.garage.zfs 
cat /mnt/bup/orignhostname/originhostname.garage.zfs | zfs receive -Fdu tank

zfs list tank -o mountpoint 
MOUNT_POINT=$(zfs list tank -o mountpoint | tail -1)
mkdir -p $MOUNT_POINT
zfs mount tank
cd $MOUNT_POINT
zfs status

find `pwd` > /tmp/all_zfs_restored.txt
shuf /tmp/all_zfs_restored.txt | tail -1000 | sed -e 's/^/"/' -e 's/$/"/' | xargs md5sum > /tmp/backup_restore_samples.txt 2>/dev/null
scp /tmp/backup_restore_samples.txt $USERNAME@originhost:/tmp

# IF os has fancy modern gnu md5sum:
##ssh $USERNAME@originhost "md5sum --check /tmp/backup_restore_samples.txt > /tmp/backup_restore_verify.log ; cat /tmp/backup_restore_verify.log | grep -v ' OK$'"
# ELSE

#now on originhost:
cat /tmp/backup_restore_samples.txt | awk '{print $2}' | sed -e 's/^/"/' -e 's/$/"/' | xargs md5sum > /tmp/originals_hashes.txt
##maybe... diff /tmp/originals_hashes.txt /tmp/backup_restore_verify.log
 cat originals_hashes.txt | awk '{print $2}' | xargs -J % grep -h % originals_hashes.txt backup_restore_samples.txt
 #maybe someway to only show those that don't have matching twin lines