The individual trades in exchanges don't hit the wallet. Only deposits and withdrawal's do. The trades themselves are handled by the exchanges database. You ca

The individual trades in exchanges don't hit the wallet. Only deposits and withdrawal's do. The trades themselves are handled by the exchanges database. You can pre-generate addresses in a wallet and then do a backup. This backup is valid and can be used to recover funds as long as that pre-generated pool doesn't run out. There's also a 'backupwallet' RPC command that the bitcoin daemon provides to safely copy/backup the wallet. So lots of options available.