If you receive the following error:

Compilation Error Description: An error occurred during the compilation of a resource required to service this request.

Please review the following specific error details and modify your source code appropriately.

Did you ever want to open the Windows Task Manager and couldn't find an empty space on the
Taskbar on which to right-click?
 

And how about Ctrl+Alt+Delete - how awkward is that key combination?

The creation of a shadow copy has timed out.
Try this operation again. (0x81000101)

You should get into the habit of backing up your Kentico CMS website. It is actually very easy to do - go to the Kentico CMS Site Manager and click on the Export Site icon. At this point follow the steps in the wizard and the resulting backup will be placed on the file system under the CMSSiteUtils\Exports directory.

CMS Transformations CMS.Transformations are missing.