License

This depends on your license type.
I would advise you to contact your Commvault Representative/reseller for pricing queries.

Subscription or perpetual does indeed make a cost difference, but it also depends if you have your own license or use a platform provided by a MSP.

@Command Center error , the answer is more complex than something we can cover in a post here.

I found your account rep, and will have them reach out to you.