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...ge file of the guest. I have the idea of the following procedure: - Shutdown the guest (i can live with a downtime of a few minutes, it will happen in the night). And i think it's the only way to have a real clean snapshot - create a snapshot with snapshot-create-as: snapshot-create-as guest testsn --disk-only - start the guest again. Changes will now go into the overlay, as e.g. inserts in a database - rsync the base file to a cifs server. With rsync not the complete, likely big file is transferred but just the delta - blockcommit the overlay: blockcommit guest /path/to/testsn --active --wai...

...lace no-whole-file" options to really transfer/write changed bits only. If that does not cut in, you can try with bdsync[1] or blocksync[2] [1] https://github.com/TargetHolding/bdsync [2] https://github.com/shodanshok/blocksync >> - blockcommit the overlay: blockcommit guest /path/to/testsn --active >> --wait --verbose --pivot >> - delete the snapshot: snapshot-delete guest --snapshotname testsn >> --metadata >> - remove the overlay >> >> Is that ok ? How "safe" is blockcommit on a running guest ? > > Yep, that's the right wa...

...ean snapshot of a live guest. But > shutting down is indeed safe, and easier to reason about than worrying > whether your qga interaction is properly hooked into all necessary > places for a live quiesce. > >> - create a snapshot with snapshot-create-as: snapshot-create-as guest testsn >> --disk-only >> - start the guest again. Changes will now go into the overlay, as e.g. inserts >> in a database >> - rsync the base file to a cifs server. With rsync not the complete, likely big >> file is transferred but just the delta > > We're also tryi...

...stent point, for a clean snapshot of a live guest. But shutting down is indeed safe, and easier to reason about than worrying whether your qga interaction is properly hooked into all necessary places for a live quiesce. > - create a snapshot with snapshot-create-as: snapshot-create-as guest testsn --disk-only > - start the guest again. Changes will now go into the overlay, as e.g. inserts in a database > - rsync the base file to a cifs server. With rsync not the complete, likely big file is transferred but just the delta We're also trying to add support for incremental backups int...