[quote name=“d2” post=“35413” timestamp=“1385057006”]
[quote author=midwaycy6 link=topic=4580.msg35399#msg35399 date=1385055342]
[u][b]But If you add a new Address, you have to backup it again, otherwise 1 backup should be fine.[/b][/u]
[/quote]
This is not true. Infact, you actually don’t have to backup the wallet.dat at all if you don’t want to as long as you have the private key (but I advise you to have a couple copies of it anyway).
[/quote]
Wait, how is that not true exactly? When you add a new address, you’re adding the private key to the wallet. If you don’t have that private key (which you won’t, because you used the “New Address” feature), and you lose the wallet, you’ll lose any coins sent to that address.
The caveat to this is when the client pulls the private key from the pool, of which the client also pulls from for change addresses. So if you back up your wallet, and you make 100 new addresses, or you make 100 transactions on existing addresses, or any combination thereof, you’ll need to back up your wallet again.
That’s why HD keys are the best bet: You back up your HD seed once, and you can always regenerate the addresses.