The account used to read the backup (bkf file) is the Schedule account (account that the scheduled task runs as). If this account does not have read rights to the location where the backups are stored, an Access Denied error is logged in the Autobjects.log file when Diagnostic logging is enabled.
Ensure the schedule account has at least read rights to all locations where the backups are stored for all domains backed up. If different accounts are needed for different domains, create additional collections so that different schedule accounts can be set for each domain.
An Enhancement Request, RMADFE-878, to be able to access the backups if the scheduled account does not have rights, has been submitted to Development for consideration in a future release of Recovery Manager for Active Directory.