I used to use a 2 Hard drives in caddies and backed up a 3 peer to peer computer network at work and 2 pc network at home. worked fine until 16 month old son played this toy ain't fun no more and chucked it down the stairs.
I now use a cd burner slightly limited on how much you can backup but much safer and easy to store. Daven
I use two hard drives also... with a CD burner as well to give me periodic archive disks of my data.
I've not found an easy way, though, to back up my (Windows) directory structure, program updates, etc etc etc.
Also, synchronizing larger data directories is often tricky. What I usually do is to rename my backed up directory on the second hard drive, make a new backup, and then delete the old backup. Is there an easier way?
QuickBooks Pro 2001 offers an automated online data (encrypted) backup and recovery services. I've been using it for a couple of weeks (the first 30 days are free).
You choose which directories you want backed up, and it saves information incrementally, backing up only the part of a file that has changed since the previous backup. It backs up once a day at a random time in the background.
Fred Langa has a very good article about backups here [langa.com] for WIN9X/ME/NT/2K/XP...and it's free for the most part. Look into buying a copy of DriveImage...version 5 can be scheduled with Windows Task Scheduler to backup while you sleep.