An encrypted KeePassXC database backup can be intact yet unusable if its required key file was left on a lost USB drive. Check the complete unlock requirement while the original still works. A database copy and a remembered password may not be enough.

Identify the database and the key file used for that specific database. Record their protected storage locations without writing passwords or key contents into a support note. Keep the working copies unchanged throughout the rehearsal.

Preserve the required file, not a similar replacement

KeePassXC describes a key file as additional key material whose contents must remain unchanged. Losing it or changing its contents can remove access to the database. Its guidance recommends a protected backup and keeping the key file separate from the database, rather than distributing both through the same cloud-sync path.

A newly generated key file is not a substitute for the missing one required by an existing database. This exercise concerns recovering with the current required material, not changing the database's security settings or creating another key with the same filename.

Use an appropriately protected rehearsal location. Copy a known database backup and the corresponding preserved key file there, maintaining the separation required by your recovery arrangement. Avoid emailing either file or placing the combination into an ordinary shared troubleshooting folder.

Prove that the recovery copies can unlock

Open the copied database explicitly from its recorded path. Select the preserved key-file copy and provide the other required unlock material locally. Do not rely on a recently opened database tab that could still be showing the normal working file.

After unlocking, inspect a harmless identifying entry or note that establishes which backup revision you opened. Record only the database identity, backup date and successful result. A screenshot of the unlocked entry list can expose more information than the recovery record needs.

Close the rehearsal copy and verify that normal work still points to the intended live database. Keep the tested recovery material under the agreed protection rather than merging it into everyday files for convenience.

If the test fails, retain the working original and establish whether the wrong database revision, wrong key-file copy or another unlock requirement explains it. Do not edit the key file in a text editor. The acceptance result is a demonstrated recovery path using preserved material, before a missing device turns uncertainty into an access failure.

Sources: Official documentation.