The short answer
Make an encrypted backup on the old phone, put it somewhere the new phone can reach, install the app on the new phone and restore. Confirm the vault opens and the count looks right before you erase anything.
Why not rely on Quick Start or an iCloud restore
They restore app data as it was, which usually works, but a vault's encryption keys can live in places a transfer handles differently, and some apps warn that their files do not survive. The vault's own backup is the version the developer designed to move. Use it, and treat the phone transfer as a bonus.
Moving a Kryptis vault
- On the old iPhone, open Settings, Create Encrypted Backup. Choose whether to add the extra lock with your recovery words.
- Save the file to iCloud Drive, or to a computer over Local Transfer, or to any folder outside the app.
- On the new iPhone, install Kryptis and choose Restore Encrypted Backup.
- Pick the file, enter the passcode the backup was created with, and the recovery words if the extra lock was on.
- Open the vault, check albums and counts, then erase the old phone.
If Automatic iCloud Sync was on, the latest automatic backup is already in your iCloud Drive and can be restored the same way. Each device keeps its own automatic backup; they do not merge.
Moving another app's vault
Look for the app's own backup or export before anything else. Locker's listing says files are only on the device and cannot be recovered if the app or phone is lost without a device backup. SPV says deleting the app deletes its data. Cloud-based apps such as Keepsafe restore by signing in to the account. Whatever the app, open the vault on the new phone before wiping the old one.
What to check afterwards
- The vault opens with the passcode you expect.
- Albums, counts and a few known items are present.
- Recovery words are still saved somewhere outside both phones.
- The old phone is erased only after all of the above.
