Symptom
A virtual machine that was added to subclient content rule by browsing and selecting the VM display name is not included in backups, or a specific virtual machine that was added to a filter is not excluded from backups.
Cause
If a virtual machine is added to a content or filter rule by browsing and selecting the VM display name, discovery is performed based on the GUID for the VM. If that virtual machine is later restored in place from a backup, a new GUID is generated, and that virtual machine is no longer identified by the rule.
Resolution
To identify a virtual machine when the GUID has changed, you must remove the old rule, then create a new rule or use a name pattern for the rule.