08-20-2011,04:44 PM
FAT32, since you should backup the system through the backup option in the system menu.
What I do is remove all my (Converted to) HD Games, Games, Movies, and Music. Since I use PS3 Media Server I don't usally have movies or music on my PS3.
Then I go into home/<not sure>/exdata and backup the act.dat file if you have any DLC that requires activation. If not, there shouldn't be an act.dat file here. If there is, grab it since the system backup doesn't back it up.
I don't bother with trophies, but you can back those up. I've never tried however and I'm not sure how it works.
Then with the system as light as you can get it, make the backup. My backup is ~500MB, though if I move the Disgaea data folder and extra files in exdata then format I could make it smaller. I'm not overly concerned with doing that however since 500MB isn't too big.
After that, do the drive swap, install the firmware (Slim only), restore the backup. From there on, it's back to doing whatever you want.
The backup saves game saves and game data. If you have game data from games that install it by default (White Knight Chronicles comes to mind) I suggest deleting it if it's not an update.
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