libvirt - incremental backups for raw devices – Michael Ablassmeier – ..
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Skimming through the latest libvirt releases, to my surprise, i found that latest versions (>= v10.10.0) have added support for the QCOW data-file setting.
Usually the incremental backup feature using bitmaps was limited to qcow2 based images, as there was no way to store the bitmaps persistently within raw devices. This basically ruled out proper incremental backups for direct attached luns, etc.
In the past, there were some discussions how to implement this, mostly by using a separate metadata qcow image, holding the bitmap information persistently.
Read more abbbi.github...
