Fiona Ebner ... How is Backup Fleecing Going?

Sorry to bug you. There are so many people waiting for this feature.
Can you give us some crumbs?

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See here.
https://lists.proxmox.com/pipermail/pve-devel/2024-January/061470.html

When a backup for a VM is started, QEMU will install a
"copy-before-write" filter in its block layer. This filter ensures
that upon new guest writes, old data still needed for the backup is
sent to the backup target first. The...

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