Windows Backup Fails and you receive the following Event ID
EventID: 517
Source: Backup
Description:
EV_RenderedValue_0.00
2147943517
%%2147943517
The resource loader failed to find MUI file
Solution:
This is a common issue and the way I was able to resolve it is to resize the C partition. For some reason VSS can't read the last part of the C partition and will fail at 99% (You can verify this by trying to run backup in a command line)
Just go to Disk Manager and resize and shrink the C partition by some small amount. 10MB or something. Then try to run the backup again.