Disk (SSD )Performance Question

[Dunuin]

So I have asked them for a zfs based storage, because I thought zfs is needed when using a ProxmoxBackupServer.
But now I think, a LVM based storage is better suited for performance reason. I get same performance with lower price.

Jup, you just don't get all the nice features ensuring data integrity. Copy-on-Write, journaling and checksumming comes with very big overhead, so reduces performance, but still might be the better choice if you care about data integrity and reliability.