I want to reformat the PS3 hard drive because currently, its not using all the space on it. 10GB isn't being used because its in a separate partition left over from an old Linux installation that can no longer be used (thanks Sony). I need to back up the PS3 so I don't have to download my PSN games again and so I don't loose my PlayTV recordings (which can't be copied onto another drive because they're more than 4GB each). I have a portable hard drive that's already formatted in FAT32 but it has a lot of other stuff on it.
My question is, if I back up the PS3 to a portable hard drive that already has stuff on it, will it just back up into a directory or will it reformat the portable drive and clone the PS3 hard drive onto the whole portable hard drive?