After performing a backup there are several folders which are not backuped because access is denied.
I use an administrator account and the folders can be opened using explorer.
Access for example is denied to:
C:\Windows\WUModels
C:\Windows\SysWOW64\Tasks
C:\Windows\SysWOW64\NetworkList
C:\Windows\SysWOW64\Msdtc
C:\Windows\SysWOW64\Configuration
Is it Access Denied? I imagine that the folders can also be locked for various reasons, so you need to use snapshots to get access to it.
You should also verify that a restore has the intended effect. This part of Windows can be slightly picky and not always as simple as just putting back the files.