Note: This has been fixed in OpsCenter 6.0.1
Backups including a keyspace with a Materialized View (DSE 5.0+) to an S3 or "Local FS" destination fail with the following error:
ERROR: Unhandled error in Deferred: u'NAME_OF_MV'
where "NAME_OF_MV" is replaced with the name of a the materialized view in the keyspace.
This is an issue in how opscenterd processes status updates from the DataStax Agent. There is no workaround at this time.
This ticket can be referenced with the following ID: OPSC-9328.