We've tried using AGOL Assistant and ArcGIS Assistant to copy our hosted feature services across from one Portal to another Portal (part of a Portal migration due to a team breaking away from another team).
ArcGIS Assistant only supports copying referenced items (rest service still pointing back to original portal)
AGOL Assistant copying in "Full" mode is unstable, and either fails for the larger services or doesn't bring the symbology across.
We would like a script that will look at the old feature service, download it as FGDB to a local drive and then publish back up to the new portal, with matching naming, metadata, symbology, and - if possible - the same group sharing (pointing to new identical groups on new portal).
Has anyone done this before?
We would probably then use AGOL Assistant to repoint the layers in the WebMaps to the new URLs, but would be keen to hear other options on this too.