Not to be a pain, but before I take the plunge and try Velocity and\or the GNM_Turbo4 I want to make sure I have safe guarded myself against any problems. The only part of these processes I don't get is when and what caches to wipe. I installed the ROM Manager and backed up my current ROM. If something should happen and I need to restore that ROM, do I need to wipe the dalvik cache & cache like I do before I install a ROM? Also, I never want to wipe data cache right? When installing a custom ROM is it the same thing, wipe dalvik cache and cache but not data?