If I backup my ethereum wallet, and then add to it, will the backed up copy have the funds in it?

Question

So if I follow this guide, How to backup mist wallets?

and backup my mist wallet, do I need to back it up again? Or will the backup contain all future funds?

Answer 1

Yes.

Any copy of your wallet will have access to all ETH (or any other token) that it possesses. This is because wallets consist of private keys which identify the holder as the owner of a given address on the blockchain. As long as you have that key, you can access that address.