“With Snow Leopard, Apple has streamlined and simplified the process of installing Mac OS X. While older versions of OS X made you decide what kind of installation you wanted to perform before you even specified what to install, Snow Leopard’s installer gives you a single installation path. It’s considerably easier,” Dan Frakes reports for CIO.
“Gone, for example, is the old Clean Install option–which moved your existing OS and system add-ons to a Previous Systems folder and installed a fresh copy of the OS, requiring a good amount of tweaking and transferring of files afterward,” Frakes reports. “Instead, Snow Leopard provides a more intelligent installation process that makes such tweaking largely unnecessary. The Erase and Install option is now gone, too (at least as a discrete Installer alternative.”
Frakes advises, “Let me also suggest that a major OS upgrade is the perfect chance to check your drives for problems, clean house, and check for updates for your frequently used software. (Don’t forget to check for new versions of preference panes and other add-ons that run in the background.) Finally, as with any major software update or upgrade, you should be sure to back up before installing Snow Leopard.”
Full article here.