I think I'll pick up a LBP Vita bundle this week and see how I fare with the 4GB card that's included. Now, I'm still not clear on saves and backups, even after reading the FAQ in the OP (thanks!). So thanks for your help in advance.
If the game saves on the cartridge, nothing to worty about, right? Which games do so currently?
If the game (retail or digital) saves to the memory card, I have to back up the whole Vita in order to remove the game and not lose my save? Then what happens if I want to restore it later on? Do I lose everything I've done in the meantime? Can I mix-and-match backups or do partial restores?
What's the difference between backing up to my PS3 or my Mac? Is it true games need to be in "install bubble" form to transfer from PS3 to Vita?