Check whether all files required for backup restoration are present before initiating the restoration.

Check whether all files required for backup restoration are present before initiating the restoration.

The issue names the backup restoration flow but provides no file or test locations. Start by locating the restoration entry point and the logic that accesses required backup files. Done means restoration stops before starting when any required file is absent, with the missing-file condition reported clearly.

Written by the indexing model from the issue text.