WalletBackupProvider

Interface for modular wallet backup storage providers.

This abstraction allows for different backup backends:

• LocalFileBackupProvider: App files directory (auto-synced by Google Backup / iCloud)

• CloudKeychainProvider: Direct iCloud Keychain / Google Backup API (future)

• ExportFileProvider: User-managed export file (future)

• ServerCloudProvider: MPC managed share (future) (mpc-client-sdk library)

• EmailRecoveryProvider: Email-based recovery (future)

All providers store ENCRYPTED data - they never see plaintext keyshares. The encryption/decryption is handled by BackupEncryption before calling these methods.

Inheritors