Indeed, a bug corrupts backups of the game and an impressive number of players (see Ubisoft forums) send bug reports from Ubisoft every day.
The character is stuck in the start screen of the game without the player can not do anything else all over again. Imagine the anger of the players who came to 90% completion.
So last fortnight, Ubisoft says they treat the problem, but we still see nothing coming.
I can therefore strongly recommend to wait before buying this AC III Vita.
Cordially