It’s not clear to me what they mean by that. The definition of a snapshot is that it’s static, so you can roll back to it. If it’s automatically updated all the time, it’s a mirror. The same with backups in general. The most common use of a backup is restoring a file that you deleted by accident. If the deletion is immediately propagated to your mirror, you can’t use the mirror that way.

What exactly do you want? Maybe something like Ceph replication? Hetzner at one point offered that. I don’t know if they still do. Same with OVH.

What’s wrong with Hetzner? I’ve generally found it better than Scaleway.

Maybe go on lowendspirit.com and ask there.