See Backup page for backing up your wallet using the Main Menu "Full Backup" option.
This page is about writing down your wallet/platform seed, and recovering using that.
Backup wallet seed: The seed alone will back up your bytes but not your blackbytes. This is important! (It means "backup platform seed")
Recovery from seed: Recovery is available in single-sig (i.e., not multi-sig) light wallets from version 1.10.1.