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Settings → Backup → Save Encrypted Backup makes one password-protected file, encrypted with AES-256-GCM, and asks where to save it, such as Files or iCloud Drive. The backup password is separate from the app passcode. The app does not store it, and a forgotten backup password cannot be recovered.

Restore Previous Version can bring back a recent class from up to five previous versions kept on this device. Those copies are deleted with the app and lost with the device, so they do not protect you if you delete the app or lose your phone. For that, keep an encrypted backup saved in Files or another place you choose, and keep its password somewhere safe.

The app passcode and privacy cover are optional. The passcode is 4 or 6 digits; manage it in Settings → Passcode. When a passcode is saved, opening the app again asks for it. The privacy cover hides the screen when you leave the app. The app cannot show the original digits back to you, because only a hash is stored in the device Keychain.

• To remove one student, edit that student and choose Delete Student. The saved photo and name-quiz progress for that student are removed. The seat is left empty.
• To remove a chart, delete it from the chart screen. Its classroom photo and seating-game progress for that chart are removed.
• To remove the app’s local files, delete the app from your device. If you set a passcode, its hash is in the device Keychain and may remain after the app is deleted. Backup files you saved in Files or iCloud Drive are not deleted with the app.

Export builds a PDF from the options on screen and hands it to iOS. You choose where a share goes. Printing uses the printer you select. Those destinations are not operated by this app.

Email: avansardar@outlook.com

Describe what happened and which device you're using. Please don't attach student names, photos, or backup files — they aren't needed to help.