Not really. If you break that down you're say, backup solution backing up to backup solution.
What is the use case?
Supported OST appliances are listed in the BE HCL. Links to all BE compatibility lists over here:
You will see that the old PureDisk 50xx Appliances are still supported, but these appliances are EOL.
The newer NetBackup 52xx and 53xx Appliances are not supported.
Veritas Access Storage (including Access Appliance) is supported as Cloud Storage.