I use a script, cron, and tar or (more recently) cpio to mirror important parts of disks on 2 machines at home. The machine #1 mirrors stuff from #2 and vice versa. They are mounted over NFS. The scripts use copy-the-delete to prevent accidents, and I use gzipped archives. Since I mostly work on small projects, I backup these on floppies, also using tar and gzip. Peter