when i was backuping my 64 GB memory card with lots of games i noticed 57/ of 64 gb was in use, which is actual 60 gb. After the backup was made 52,79 gb was written to pc. This missed almost 5 gb so i thought something was up. turned out metal gear solid HD was only 20mb copied isntead of its full size 3300 mb. I had not gotten any error while backing up either. This makes it 55,9 GB. only +- 2 GB difference. I cannot exactly say where this difference comes from, i compared all the games and there are not many big differences like metal gear solid. But i do see with a lot of apps. for example YS celceti is 912 MB on vita and 800+ mb on pc. and so on. some apps have bigger difference, some only a couple MB. some none. So whats up with that? can i trust this backup?