Question [Q] Fascinate - Updating Superclean

I've been running Superclean for a while now, but I'm looking to update to the latest milestone version. When I flash SC3 MS2 over my SC2.6.something, will it wipe all my data or just affect the system?

I'd rather not have to go through all the work I went through when I sampled ROMs on this phone before.

Thanks.

Jim