Archive and install will install a fresh OS on your HD and segregate the old one in a folder at root level. It also keeps most everything else just the way you had it, with the exception of either deleting or disabling Stuffit Expander. So it is as 'clean' as a total re-install without the hassle. Under any OS X there should be no need to wipe the HD unless there is something wrong with it. Just repair permissions and use DiskWarrior to rebuild the directories after the install and all should be well. My archive and installs to Panther and Jaguar went flawlessly on 3 machines.