If I would format the Ps vita, could I get my save files back from my EU account if I will try to transfer it to my JP account? I just made a japanese acc to buy some dlc for the ps3 and ps vita and I don't want to lose my save files. ---- edit ---- Nvm, I'm screwed. Spoiler You can only restore a backup file to a PS Vita system linked with the same account as the one that the PS Vita system was linked with when the backup file was created. You can also restore the backup file to the different PS Vita system, if that PS Vita system is linked with the same account. link: http://manuals.playstation.net/document ... up_pc.html
you need to backup your savefiles with the CMA first. the only problem is that you won't be able to use your savegame with an other account. if you switch back to the EU account again, you'll be able to use the backup again. i recommened to you to get a second memory card anyway to make sure you can keep your savegame for the EU account. then reset the vita WITHOUT formatting the memory card. then take out the memory card after restart (which will result in an error message and the vita will restart once more, but put the other card in the vita first). you won't be able to use the same card for multiple accounts if you run vita version 1.6 or higher.
Well I have a back-up on my ps3 now. Formatted everything ~_~ Time to have some fun again with perfects xD