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I understand the concern. I use DP with x2 duplication and Windows Server Backup and that indeed relies on VSS. So what I have done is I created two Pool (Q:\ and R:\) with x1 (so no) duplication and then created another Pool P:\ that consists of Pools Q:\ and R:\ and Pool P:\ does have x2 duplication. This way I have the best of both worlds I guess, I got x2 duplication and x1 backup. It would work similarly with x3 duplication, i.e., create three Pools without and then add them to a Pool with x3 duplication etc. It is not without its compromises, you would want, for instance, each underlying Pool to be roughly the same size and as if and when a disk in the Pool that is being backed up fails, you may need to review the backup settings (as it may need to point to a replacement disk).