If you are running ONTAP 9.2 or later, you can set up StorageGRID as the cloud tier for FabricPool.
Doing so enables ONTAP to access the data in StorageGRID without interruption.
cluster1::> storage aggregate object-store config create -object-store-name mySGWS -provider-type SGWS -server mySGWSserver -container-name mySGWScontainer -access-key mySGWSkey -secret-password mySGWSpass