As most of you may know, wiping data is kind of a pain (well, the "restoring" data is the pain).
NOT wiping it tends to cause a bootloop when changing roms.
Can I use CWM backups to avoid wiping data?
For instance - Let's say I'm using Apex, but CM7 has had an update and I'd like to try it out. Can I flash my CWM backup of CM7, and then flash the CM7 zip (which usually doesn't require wiping data) to get the update? Naturally, you can reverse the names here and the same idea applies.