Bleg for info – Linux backup tools and services

One of the comments that got lost in the recent database restore was a pointer to a backup program I can’t offhand remember the name of. I remember that it’s a command-line tool written in Perl (alas) and meant to be done by a cron job; what it does underneath is rsync with hardlinks to the remote target, so you get a Time-Machine-like effect for not much beyond the space requirement of the initial dump. Can someone remind me what this is. please?

Also, I’m in the market for a dropbox-like service that I can rsync to and from, for off-site backup. Any suggestions?

UPDATE: rsnapshot is what I was trying to remember. A very elegant little tool, thoughtfully written and handy. I may go with rsync.net for offsite backup.