Should I be backing up my wallet everytime I get a payout, or is backing up my wallet only once enough. What I mean is, if I where to lose my phone and then restore my wallet, would it restore the last balance I backed up or the last balance I had before I lost my phone? Thanks.
Everything is stored on the blockchain, so it will restore only the valid balance according to the blockchain. If you were able to restore old, invalid balances it would be a major flaw in bitcoin.