In Reply to: It's not suss at all posted by clovis on Tuesday, 24. September 2013 at 09:59 Bali Time:
I think they just scanned it into their computer but they did ask for it to copy. The registration form didn't have any passport details boxes to fill in.
We have had ours copied in Bali, not everywhere, and there doesn't seem to be a standard that it is big or small hotels that do or don't.
We have also been told they have to report numbers to somewhere official, not sure we have ever been told exactly who or where.
The immigration form on the plane must go somewhere as once our flight was delayed and we were contacted at the hotel to tell us, there would have been no other way they knew where we were. Back before email and mobile phones!