I understand, thanks for sharing the plan.

I'm not sure the community is looking for something like that, but for what it's worth, here is what Proxmox is proposing for ZFS capable SAN appliances: https://pve.proxmox.com/wiki/Storage:_ZFS_over_ISCSI

AFAIU, it's a storage class based on a framework using ssh to create ZVOL and share them over iSCSI on a SAN appliance. Storage snapshots are then triggered on the SAN.
And it's apparently possible to provide your own SAN implementation as a plugin.

Sounds like part of a solution to me, but I have no idea whether it would be suitable/desirable for XCP-NG.

thanks, I found out Settings->Plugins->web-hooks which allows just this upon metadataBackup events.

Aren't there any backup integration existing for backup with SR on SAN?
Aren't typically the snapshots done on the SAN side in these cases but need to be driven by XOA ?

I thought it would be a fairly common use case for enterprise setup.

My personal use case though, is to deploy VMs on an XCP-NG instance deployed on a dedicated baremetal server and use SR from SAN/NAS storage (iSCSI & NFS/SMB) implemented by a dedicated TrueNAS server instance.

I'm fresh new XCP-NG user, currently evaluating virtualized on Proxmox with the intent to replace it as the baremetal hypervisor for VM and plug it on a TrueNAS instance for SAN/NAS SRs. So far it's a pretty exiting interface and tech stack that I'm discovering, and I like the extensive Hardware Compatibility list issued from xen server.

It seems a bit hard to automate immutable OS deployment (like CoreOS/Flatcar) because of the ignition file parameter but I'm reasonably confident I'll be able to make do somehow (an adapted PXE config or maybe https://matchbox.psdn.io which seems promising to achieve just this)

But what I still can't wrap my head around is how I will be a lot to put a backup/snapshot strategy with a ZFS based SAN/NAS.
As far as I've read, Metadata Backup seems to be what I need, but I haven't found out about any configuration/hook/plugin that would allow me to sync a metadata backup with basically a ZFS zvol/dataset snapshot.

What would you advise on a way to achieve this ?