. . . . and I wonder . . . how I've had such good luck with six or seven OC configurations . . . when I continue to live "on the edge."
Those of you who keep an old computer running as a file server on ethernet LAN, possibly even for a 3-drive RAID5 array -- I haven't explored VISTA yet -- that's "in the works" -- but I know Win 2000 Pro, XP Home/Pro/MCE2005.
There's a little utility that should be loaded when you install the OS, or it's "installable" through "Add/Remove Programs" from the install disc. It's called "Backup" -- or in the case of Win2000Pro or Advanced Server, "NTBackup." Roxio and other suites now provide it as "Sonic Backup" -- once known as BackupMyPC, but I haven't found anything these similar programs do that the XP Backup program doesn't do.
The program features a scheduling capability, so that you can set it to back up your e-mail files, Favorites and BookMarks, photos, Quicken files, audio and video files (but the video stuff is probably too big and impractical) -- anything -- by creating "jobs" and then scheduling those "jobs."
I create a full backup and re-write it every three months. In between, I make "incremental" backups for the full backups. Once in a while, you can backup the backups to DVD-R.
Then there are the "Repair disks," and the use of a utility like Partition-Magic or Partition Commander to dupe your hard disk partition to a spare drive. There's about twenty ways to assure data integrity and backup, but many people just don't do it because it either requires attention to detail when done manually, or attention to detail when you set up the jobs and schedules.
But in this house, "Backup" has . . . . saved . . . . our . . . . silly . . . . A**es.
Others will differ, except for the duplication of an entire disk with the utilities I mentioned, but IT professionals I know who are still working for a living say they prefer to rely on an exclusive data backup on a regular basis, willing to reinstall the OS from scratch and all the programs. For that, I'd still backup downloaded/compressed program installation files once to USB HD or DVD, and keep a NotePad inventory list (even better with a database program) of all programs you install to your hard disk.