Symptoms

The error might be reported during backup (VSS-Aware backup sets): "The system cannot find the file specified.  (\\[Server_Name]\ADMIN$\complusbackup\[XXXXXXXXXXX]\sfcfiles.lst)" ,

where [Server_Name] is the backup source Server name;

[XXXXXXXXXXX] is the backup session ID#.

Cause

Remote Scheduled Task Management is not allowed through Windows firewall in the computer attempted to be backed up.

Workaround

Enable Remote Scheduled Task Management service on the backup source Windows Server:

Control Panel > Windows Firewall > Allow an app or feature through Windows Firewall > highlight "Remote Scheduled Task Management service" and tick the check-box for the network profile used for backup ("Domain", "Private" or "Public")