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+# Common snapshots and holds
+
+![image](https://user-images.githubusercontent.com/1179017/165788773-b6e1301d-bc55-4b17-9ef0-a327e791b765.png)
+
+If you're new to ZFS these terms can be quite confusing. Whats going on?
+
+## Common snapshots
+
+ZFS can do incremental transfers via snapshots. It can only do this from a snapshot that's common on both the target and source.
+
+If there is no snapshot in common, the only way to continue is to destroy all the whole dataset (and all its snapshots) on the target and start from a full backup.
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