To backup the current Task configuration of a QlikView server, make a copy of C:\ProgramData\QlikTech\ManagementService\QVPR.
To Restore a Task configuration, replace the QVPR directory with a copy you made earlier.
Stop all services before making changes to this directory.
Tasks, Triggers and all settings are stored in XML files (a lot of them). I'm not sure, but I don't think there is a lot of documentation available. Good luck.