I've been using my mac mini as a backup server for ages. Over the weekend it died. I'm almost certain it's the hard drive.
I'm going to attempt to replace the hard drive, and I should even get some extra space if it works, but I'm thinking it may be time to upgrade my storageness.
At the moment I'm tempted by the ReadyNAS Duo. Lots more storage, RAID, hopefully less to manage, and I'm told it probably does the rsync things I use at the moment for backups.