I am having some issues with the backup. The latest entry in the logs says this:
FATAL - Engine failed.
System.IO.FileNotFoundException
Could not load file or assembly ‘AlphaVSS.60.x64.dll’ or one of its dependencies. The specified module could not be found.
Make sure the following packages are installed:
Microsoft Visual C++ 2010 SP1 Redistributable Package (x64)
http://www.microsoft.com/en-us/download/details.aspx?id=13523
or (x86) - depending on OS architecture
http://www.microsoft.com/en-us/download/details.aspx?id=8328
Microsoft .NET Framework v 4.5.2
https://www.microsoft.com/en-us/download/details.aspx?id=42642
or Microsoft .NET Framework v 4.0 - if OS is Windows Server 2003
https://www.microsoft.com/en-us/download/details.aspx?id=17718
After that please try re-installing Backup software. It should help.