Being an HPE Employee I can only suggest that MSA is already giving snapshot feature which is block level data backup technology. Apart from that if you want to keep data to somewhere else apart from your production MSA then you can buy another MSA and configure replication between them so that you can maintain redundant copy in other place as well. Now in case you have any issue then you can recover your data from the snapshot or from the replicated volume.
Regarding VEEAM I know they don't support MSA and why not that they need to answer as that's within their scope.
Regarding any other 3rd party application I can't comment because why will I give business to some other vendor when I know HPE have these solutions already available. However you can always consult with your Solution Architect or the designer who design your setup.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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