Okay a serious question:  What's the best way to backup wallet?  I wrote down restore phrase and wrote down encryption key.  Do I need to backup anything else?  I couldn't find a wallet.dat in application support (mac)

Byteball Backups and Recovery

Byteball uses a single extended private key for all wallets, BIP44 is used for wallet address derivation. There is a BIP39 mnemonic for backing up the wallet key, but it is not enough. Private payments and co-signers of multisig wallets are stored only in the app's data directory, which you have to back up manually:

macOS: ~/Library/Application Support/byteball
Linux: ~/.config/byteball
Windows: %LOCALAPPDATA%\byteball