I'd suggest an overview of backup solutions supporting XCP-ng here (sticky) or on the website.
I just noticed that Commvault also supports XCP-ng by now:
The following requirements are for the Virtual Server Agent with Citrix Hypervisor (XenServer).
Versions of XenServers Supported
Citrix Hypervisor 8.2
Citrix XenServer 6.0, 6.1, 6.2, 6.5, 7, 7.1, 7.2, 7.3, 7.4, 7.6, 8.0, 8.2
XCP-ng 8.2
Which is only accessible for registered (and maybe paid) accounts:
https://documentation.commvault.com/2022e/expert/3302_system_requirements_for_virtual_server_agent_with_citrix_hypervisor_xenserver.html
It's a bit tricky and hidden, as one won't expect XCP-ng under Citrix Hypervisor (XenServer)
I asked for (and requested the support) a while ago and Commvault was surprisingly reponspove and active to support me there (I even got a call back etc.) but that time they didn't support and said it's not on any roadmap yet.
So if anyone is considering XCP-ng for his enterprise environment, but was missing a powerfull backup solution: This might be your gamechanger.
@olivierlambert : Do you know any details about that/have been involved there?
The lack of support there was a blocker for an XCP-ng migration.
Regards
Edit: Style tags work weird...