- sync -> synchronize datasets (and subdatasets) from host 1 to host2
Fetches snapshots from host1 and host2, compare them, and send difference to host2: new datasets, and incremental stream for existing datasets
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stats: lists the number of snapshots
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clean_snaps: handles snapshot retention with buckets can use a retention.conf file in yaml format for complex snapshot retention policy XXX: implemention not finished