This article is specific for v7.0.2 and Windows 2012 alone.
There is a known bug for v7.0.2 with the following updates for Windows 2012 and system state backup
It causes the error "SplitVHDX.exe has an error (exit code = 2). See backupservice.log for more detail." within the log files.
If you are receiving this error, please upgrade your client to v7.0.3 or above to fix the issue. The installers can be found in the downloads section.