Starting with ONTAP 9.7, NDMP is supported on FlexGroup volumes.
You must be aware of the following points for NDMP support on FlexGroup volumes:
The NDMP_SNAP_RECOVER message in the extension class 0x2050 can be used only for recovering an entire FlexGroup volume.
Individual files in a FlexGroup volume cannot be recovered.
NDMP restartable backup extension (RBE) is not supported for FlexGroup volumes.
Environment variables EXCLUDE and MULTI_SUBTREE_NAMES are not supported for FlexGroup volumes.
The ndmpcopy command is supported for data transfer between FlexVol and FlexGroup volumes.
If you revert from ONTAP 9.7 to an earlier version, the incremental transfer information of the previous transfers is not retained and therefore, you must perform a baseline copy after reverting.