Over the weekend, I installed a 200GB hard drive (8MB cache, 7200RPM, $70 after MIR). This is primarily a backup drive, so I set up a couple cron jobs to manage this. Mail and web content will be copied daily, and home directories will be copied weekly. If you need daily backups of your directories, you should be able to add your own crontab entry. The home directories are backed up to /backup/home/.