I have a 2nd internal hard drive in both of my "main" Amigas, and regularly run Deniil's Backup program to copy over any files which have a newer date stamp. Simple, no compression and no messing around with large archives. Every so often I then do the same to a networked drive, and once in a while then I'll burn the important data (coding stuff mainly) to DVDs to be kept elsewhere. The files are relatively small and few, and storage is so cheap nowadays that I just don't see the need for compressing data.