The Purser's Office has a safe also. When we first boarded, the safe was missing from our room. They originally told us we would have to use the vault in the Purser's Office, but then came up with a safe to install where one should have been before. I don't know haw big theirs would be.
They will download your digital pictures for you in the camera shop if you don't require an oddball connection. I saw a post saying that the poster was unable to use the ship's downloading service because they didn't have the proper part.