Yes, you can increase this. I have done this too on a productive CEPH Storage, but you have to really really make sure you have enough space and your crush rule is correct (distribute the data to Nodes, not to OSDs).
I don't try to decrease the replicas, but I think this should work too, because it's only replicas, there is no change in the crush map needed.
You need to check your Crush Rules, it should be "step chooseleaf firstn 0 type host". If you dont know how you can change this, then you should have the correct one, because its default in PVE.
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