The primary method for saving is via cloud sync, utilizing either a Rovio Account, Facebook, or Google Play Games/Game Center.
(found in your profile or settings) today. It is your only "get out of jail free" card if the cloud sync fails. Are you currently trying to a lost account or just looking to future loss? angry birds 2 save data
Happy flinging – and may your clouds always be backed up. 🐦🎯 The primary method for saving is via cloud