Replacing the PowerMac G5 with a Mac Mini (Core-2-Duo) has worked out great so far; I really do enjoy this small, fast, and quiet computer. However, to put Mac OS X Leopard's new integrated backup program a.k.a Time Machine to work, requires a 2nd harddrive. Luckily, I had removed the secondary harddrive, which we had added just a couple months ago, from the PowerMac, before selling it and finding a nice external enclosure for the 3.5" SATA drive shouldn't be all that hard.