This is true, but it always takes me a long time to get my setup just right: bookmarks, search keywords, extensions, preferences, getting the address bar history primed...
This would be great for archival - so I can search - I want to know last year when I was on Project X about some things that would be useful right now....
pretty sure the Rescue Profile thing or Reset Profile mentioned above makes a backup copy and puts it on your desktop. Its in the usual profile dir for your OS either way, ~/Library/<something> on OS X and wow it's been forever since I used windows but under your user dir.