Updated Tarsnap Backup Script

    sysadmin tarsnap

For awhile I have been using a Tarsnap backup script written by Tim Bishop. It is very handy but recently I was setting up Tarsnap again on a new machine and I noticed that it is not designed to be run more frequently than daily. So I decided to take a stab at making it handle being run more often and keeping the number of daily/weekly/monthly backups that are actually desired.

Changing the delete portion to something like this should do the trick:

	if [ X"$DOM" = X"$MONTHLY_DAY" ]; then
		# keep monthly backups for the actual number of days even when this script is run more than once per day
		#for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-monthly-$dir" $TMPFILE | sort -rn | tail +$MONTHLY`; do
		for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-monthly-${dir}" ${TMPFILE} | sort -rn | cut -d '-' -f 1 | uniq | tail +${MONTHLY}`; do
			for x in `grep -E "^${i}-[[:digit:]]{6}-monthly-${dir}" ${TMPFILE}`; do
				echo "==> delete $x"
				$TARSNAP -d -f $x
			done
		done
	# Weekly
	elif [ X"$DOW" = X"$WEEKLY_DAY" ]; then
		# keep weekly backups for the actual number of days even when this script is run more than once per day
		#for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-weekly-$dir" $TMPFILE | sort -rn | tail +$WEEKLY`; do
		for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-weekly-${dir}" ${TMPFILE} | sort -rn | cut -d '-' -f 1 | uniq | tail +${WEEKLY}`; do
			for x in `grep -E "^${i}-[[:digit:]]{6}-weekly-${dir}" ${TMPFILE}`; do
				echo "==> delete $x"
				$TARSNAP -d -f $x
			done
		done
	else
		#for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-daily-$dir" $TMPFILE | sort -rn | tail +$DAILY`; do
		# keep daily backups for the actual number of days even when this script is run more than once per day
		for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-daily-${dir}" ${TMPFILE} | sort -rn | cut -d '-' -f 1 | uniq | tail +${DAILY}`; do
			# delete old days
			for x in `grep -E "^${i}-[[:digit:]]{6}-daily-${dir}" ${TMPFILE}`; do
				echo "==> delete ${x}"
				$TARSNAP -d -f ${x}
			done
		done
	fi

I should probably just go all the way and teach it about hourly backups, but I am feeling lazy, so maybe another time.

brd