When doing a backup with SyncTech's "SMS Backup & Restore" (com.riteshsahu.SMSBackupRestore), it creates a local backup (on internal memory, SD card, or through OTG), and I notice the size the files take up grows large quickly.

  • Is the file created a delta/incremental backup, a full backup, or something else?
  • Is it necessary to save all of them or only the newest?

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