I'm using ZREP to replicate two servers with each other and each server contains one ZFS-pool containing two datasets as replication master and two sets as replication target. The master sets contain the system and VirtualBox-VMs of the local server, the replication targets the same from the other one. //
The problem.
But from time to time it happened that ZREP got into some state not able to sync anymore. To resolve that issue, a coworker told me that he needed to delete snapshots and follow the process to initialise ZREP again all over. That problem got fixed by not let ZREP run in parallel with rsync and our own snapshot anymore in the end.
ANSWER
Yes you still get all the data in-between but you just can't rewind to in-between.
If you have snapshot's 1,2 and 3 and the remote pool only has snapshot 1, you can give it snapshot 3 and skip 2.. it just won't be able to roll back to the '2' state. But the data will still be there.
The snapshots describe what was there at the time. So missing snapshot '2' on the remote pool, it's like you never took one at that point in time. It literally doesn't know about the '2' snapshot and what stuff looked like back then.
If you change your mind, you'll need to delete snapshot '3' on the remote pool and only then can you send '2', then '3' again.
