and then, must i scan a private key ?
EDIT: ok ... just a reader to a single adress ... if i want use the single adress, i must QR code scan the private key ... and then, the program discharge the private single adress to the HD wallet.
Backup only store HD Wallet.
Remember, if any bitcoin comes to any address on your HD wallet, you will always have it.
Just because you are on Address #5 does NOT mean that you can't use #1 anymore... it just means it is hidden.
If you want to post an HD wallet address on your forum posts to receive bitcoins you can receive bitcoins forever, even if you are already using #394... #1 will still receive bitcoins to your mycelium.