Hello @CW-GIS ,
It would be great if you can share details from the logs generated by WebGISDr process (usually created where you store the properties file). It will help us in understanding at which step this is failing/which steps take such long time.
Additionally, an easy way to isolate this problem is to switch Portal logging level to "DEBUG" and run "exportsite" operation from Portal Admin endpoint by following the steps in below document :
https://developers.arcgis.com/rest/enterprise-administration/portal/export-site/#file-store-request-...
While this is running check Portal logs with "DEBUG" for more detailed error message which will help in understanding (If possible share that here)
Note : Remember to switch the logging back to way it was otherwise it can consume a lot of storage on the machine
The reason that this will help isolate is because it is what "WeebGISDr" essentially does in case of Portal for ArcGIS.
If you can share these, we can probably look for the root cause of this.
Hope this helps!