got a 320G samsung hdd for the PS3. was about to install when someone told me i would need to back-up some stuff from the system. then reinstall to the new hdd. he said do it with an external hdd.
for me that advice breeds more questions than answers

.
thought all i needed to back-up were game-saves? apparently, some other things must be transfered aswell
so i look into it a bit & discover, that an external hdd can even back-up my psn messages; some of which, i really want to keep. so now i plan to get one anyway.
as for what needs backing-up, & what doesn't; i'm still completely clueless.
any advice you guys can give on all this would be most welcome