Simple just right click drag & copy the folders with the important crap across all the hard drives, including windows/application data & windows/favorites. Only thing is I'm useally to lazy to delete old backups, so when I fo through a reformat/reinstall windows routine, I have to spend 20 mins going through my extra hard drives working out which is the latest windows/application data backup & which is the latest windows/favorites backup to drag across into my new c/windows folder.
Documents I always keep on my F drive & on my myspace.com online folder & sometimes on my D drive too. MP3s are backed up on a old conner drive - I have a CD caddie system, as I have 6 have drives. Most of the hard drives are Xerox OEM printer hard drive seconds, that were freebes. Xerox uses (or use to use) a propietry file format which would only let them be reformatted 3 times (or more likely Xerox support has a policy of not reformatting them more than 3 times), but there's no problem reformatting them with FAT32, HPFS, NTFS, Ext2 or BeIncs EB BeOS file sytem as many times as you want.
Someday I'll get orginised & make a freshly orginised backup tree of everything, then I'll delete all these old duplicate files all over the place. Maybe I'll mirror the freshly orginised backup tree on another hard drive too.