Installing multiple roms and restoring question

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http://forums.androidcentral.com – I recently joined the rooting world after realizing neither Samsung/TMO/android were going to solve my bluetooth issue with an update and have some questions that I can't seem to find clear enough answers about: 1. I have my original TMO stock backed up with CWMD to my phone's drive, is there a way I can shift to either my SD card or back it up to my PC to free up space? or do I have to restore it then reback it up to SD to shift it out? 2. When installing a new rom, I have to wipe the phone first before installing a new rom? 3. When I backup a rom, does it save the apps and all syste (HowTos)