I recently took my PB in for a check-up and transferred all my mail onto the Mac.com server (which was awsum due to it's easiness, holy cow is that useful, can't ebelive I didn't do it before) while my machine was away. But now I am wondering, can I leave it all there with the cache sitting on my Mail.app "mac.com" tab and delete all the mail from "On My Mac" tab safely? And by safely I mean will Backup when backing up all the Mail.app data in the library folder also back-up the cache of the .Mac account in Mail.app? It would be nice to get rid of the duplication!