Experiencing repeated and consistent failures of backups? It could be that your Windows system needs one (or more) of the many Microsoft Hotfixes to address the issue.
1) Please stop and disable any backups that are related to he Protected Asset (the Windows Client).
2) Perform any hotfixes required to return your Protected Asset to a ready condition.
3) Run a 1-Time Full so the Unitrends system has all changes (see KB 5580 on How do I perform a 1-Time Full/Master)
4) Enable your Backup Job.
Microsoft KBs and Hotfixes related to backup requester application