On 10/01/2021 07:41, cedric.dew...@eclipso.eu wrote: > I've tested some more. > > Repeatedly sending the difference between two consecutive snapshots creates a > structure on the target drive where all the snapshots share data. So 10 > snapshots of 10 files of 100MB takes up 1GB, as expected. > > Repeatedly sending the difference between the first snapshot and each next > snapshot creates a structure on the target drive where the snapshots are > independent, so they don't share any data. How can that be avoided?
If you send a snapshot B with a parent A, any files not present in A will be created in the copy of B. The fact that you already happen to have a copy of the files somewhere else on the target is not known to either the sender or the receiver - how would it be? If you want the send process to take into account *other* snapshots that have previously been sent, you need to tell send to also use those snapshots as clone sources. That is what the -c option is for. Alternatively, use a deduper on the destination after the receive has finished and let it work out what can be shared.
