But are the transactions themselves -- and the latest balance -- also stored in the wallet? So that one would have to back it up/make a copy of it after every deposit/transaction so you don't lose coins? Or is the wallet itself merely a "pointer" to the relevant data in the blockchain and once one has a copy of the wallet backed up say on day 1, that's all you need to show your transactions and balance forever into the future?
(newbie to crypto question...)