No data in dataset after replication

[ArchatParks]

As background I replicated a dataset from Truenas system A and Truenas system B to Truenas system C. All seemed fine. All of the data showed up on Truenas system C.
I decommissioned both Truenas system A and Truenas system B and later restored Truenas system B's data from Truenas system C via a replication.

When I tried to do the same with Truenas system A I got a message about no data (something like that).

If I go to to Storage tab on Truenas system C, I see the replicated datasets and it shows they take up 1.75T
If I go to the commend line and type "zfs list -r voldata1/replication" then I get this:

NAME USED AVAIL REFER MOUNTPOINT
voldata1/replication 1.75T 6.23T 208K /mnt/voldata1/replication
voldata1/replication/truenasA 1.75T 6.23T 192K /mnt/voldata1/replication/truenasA
voldata1/replication/truenasA/vol1 1.75T 6.23T 192K /mnt/voldata1/replication/truenasA/vol1
voldata1/replication/truenasA/vol1/nfs-backup 1.75T 6.23T 1.75T /mnt/voldata1/replication/truenasA/vol1/nfs-backup

If I try to "ls /mnt/voldata1/replication/truenasA/vol1/nfs-backup" there is nothing there.

Any ideas as to where the missing data is?