Early bash script to snapshot an entire ZFS pool (storage) and send|receive it to another pool (backups)

backup.sh

#!/bin/bash

# Capture current date as a variable
DATE=`date +"%Y%m%d-%H:%M:%S"` # example output format: 20110925-21:10:36

echo -e "\nRecursively snapshotting storage pool with tag @BACKUP_$DATE"
echo "Running 'zfs snapshot -r storage@BACKUP_$DATE'"
time zfs snapshot -r storage@BACKUP_$DATE

echo -e "\n\nDeleting backups pool to make way for new backup (usually takes a few minutes)."
time zfs destroy -r backups

echo -e "\n\nSending snapshots to backups pool (this will take a long time.  Hours.)"
echo "TIP: Run 'zpool iostat backups 1' in another terminal to see how fast the transfer is proceeding."
echo "Running 'zfs send -R storage@BACKUP_$DATE | zfs receive -vFd backups'"

time zfs send -R storage@BACKUP_$DATE | zfs receive -vFd backups # receive requires -F since backups exists

echo -e "\n\nSetting backups pool to readonly (to prevent issues with incremental send/receive later on)"
zfs set readonly=on backups # must do this every time as 'zfs destroy -r backups' above removes it

ENDTIME=`date +"%Y%m%d-%H:%M:%S"`
echo -e "\nFinished at $ENDTIME"