I can tell you how that benefiicial having everything you can burned to disk from bailing someone out a second time. When a friend's son goofed the warranry on an older emachines with XP I ended giving away the SP1 disk for use there when first finding a buy on an SP2 OEM disk. The kid trashed the store bought 1yr. old case and stripped it down later.
With the original drive finally back in I got the system up and running again with a full format and having a large variety of bmps, wavs, and utilities on disk. For the new build here 3 out of 4 drives in use will used where two will be wiped clean for fresh installations of XP and Vista there. The one drive left in the case will have to wiped as well. That second sata reflecting of what tlarkin suggested along with the data dvds still to be burned will preserve a large amount of files.