Windows Server Regback directory files failing? Commvault

I use Simpana CommVault. I've got a few WS 2008 R2 servers that constantly receive these failed items in our Backup Summary Reports

[C:\Windows\System32\config\RegBack\DEFAULT] Cannot create a file when that file already exists.
[C:\Windows\System32\config\RegBack\SAM] Cannot create a file when that file already exists.
[C:\Windows\System32\config\RegBack\SECURITY] Cannot create a file when that file already exists.
[C:\Windows\System32\config\RegBack\SOFTWARE] Cannot create a file when that file already exists.
[C:\Windows\System32\config\RegBack\SYSTEM] Cannot create a file when that file already exists.

We have VSS enabled for System State backups for each of these servers. Is it necessary to back these RegBack files up? Or can we filter/exclude these out safely? I've seen only one person in a forum ever say that excluding these was okay.

Can anyone please shed some light on this?