Thanks HI-TEC99 and CryptKeeper for clarification

What exactly I need to do to secure a backup before update to v1.0.0?
"To restore wallets, you will need a full backup of Byteball settings. Just the wallet seed is not enough"
It's vital to backup this windows folder to ensure you get your blackbytes.
C:\users\\AppData\Local\Byteball
The folder is normally hidden. If you haven't configured your computer to make it visible then click the windows orb, type %appdata% into the search box and press enter, Your hidden appdata folder should open.
It's also important to back up your wallet words (the seed) that you can view in the advanced section of your wallet.