Snapshot Pro Failing

Hi Guys,

When i try to run my initial backup with snapshot pro i get the following error.

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete

your request.
Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an

ErrorDocument to handle the request.

Can you help me figure out whats happening? The memory limit is 512mb but the peak usage was only 44.0