An Export Action Item completes the backup FeatureServer item type workflow into a local computer or another cloud storage system like S3 or OneDrive.
The portal UI for this Action Item is shown below:

The backup workflow would be a combination of Export, Download, and Delete action items. Adding a List Action item in the beginning would complete a batch export and download.
In addition the Export Action item can be used to download formats of the FeatureServer for use in other clients beside ESRI applications.
The best part to the export API (on FGDB), it includes the attachments, if there’s any.
Reference: https://developers.arcgis.com/rest/users-groups-and-items/export-item/
Current available solution is the Hub transformer from Abley. Its a great tool but it’s limited to FGDB. Quite the obvious after all since its called ArcGIS_AP_FILEGDBExport.