backwoods
Here is Noel Borthwicks experience- notice he didn't even feel the need to create a backup...
"Well I just bit the bullet and upgraded my Win7 DAW at home to Win 8 in place. I've installed Win8 a few times on work machines but those have always been clean installs before so this is my first time doing an upgrade.
The process went flawlessly and all my apps and data migrated fine. This is a 3 year old machine with a bunch of audio apps installed. X2A was intalled prior to the upgrade and it all works as before. All I did prior to the upgrade is uninstall MS security essentials and ran CCleaner to remove all cached files etc to avoid unnecessary junk being carried over to Win 8. No backups :) I started the install, went to have dinner and when I came back about 45 mins later it was about 90% through. The data migration took another 15 mins or so and it was done. So far everything I have tested is ok. Very impressive how easy and painless it was. "
Yes, but Noel had very little else, other than audio, on his machine.
I had no trouble with any audio tools - these all worked fine with no changes: Sonar X1 & X2 Producer, NI Komplete 5 & 7, Alchemy, Omnisphere, Zebra, ubhiks, Bidule, Temper, Cooledit Pro, Audacity, Hyperscore, Live 8, Live 9 Beta, Granite, Iris, Kore, Maschine... to name a few.
In fact, the Upgrade Assistant complained about Guitar Rig 4 (oddly not Guitar Rig 3) but I don't see any problems in it.
I have 351 programs now and that was after I uninstalled a huge number of MS tools.
Ironically, it was the backup tools - Acronis and Retrospect - that gave me the most grief.
Acronis stuff digs hooks deeply into the disk subsystem and starts up at boot-time. It is very hard to uninstall.