Backup and transfer

Admincraft can move all saved server profiles between computers, phones, and browsers without creating an account.

Exports contain server secret keys and may contain pinned certificates. Admincraft therefore encrypts every transfer with a passphrase before it reaches the clipboard or a file.

Export profiles

1. Open Settings → Backup & Transfer.
2. Choose Copy config or Export file.
3. Enter the same passphrase twice.
4. Move the copied text or admincraft-servers.json file to the other device.

Use a long passphrase that you do not use elsewhere. The passphrase is not stored in the export and cannot be recovered.

Import on another device

1. Open Settings → Backup & Transfer.
2. Choose Paste config or Import file.
3. Enter the export passphrase.
4. Review the number of profiles and confirm the import.

Profiles with matching internal IDs are updated. Profiles with different IDs are appended, and other profiles already on the device stay in place.

What is protected?

The transfer envelope is versioned and uses:

• PBKDF2-HMAC-SHA256 to derive a key from the passphrase.
• AES-256-GCM to encrypt and authenticate the profile data.
• Fresh random salt and nonce values for every export.

The readable JSON wrapper identifies the format and contains the cryptographic parameters. Server addresses, aliases, keys, and certificates are inside the encrypted data.

Warning

Anyone with both the export and its passphrase can recover the server secret keys. Delete transfers you no longer need, and do not send the passphrase through the same channel as the file.

Import errors

Message	What to do
Wrong passphrase, or the config is damaged	Check the passphrase and transfer the file again if necessary
Config is incomplete or damaged	Copy the entire text or choose the original file again
Made by a newer Admincraft version	Update Admincraft before importing
Not an Admincraft config	Choose the encrypted file created by Admincraft