[Borgbackup] No de-duplication on big VM raw-backups/images

[Stefan Bauer]

Hi,



use case is sending proxmox backups to remote site for disaster-recovery.



given is a single file in a directory:



-rw-r--r-- 1 root root 5.5G Feb 19 10:36 vzdump-qemu-202-2020_02_19-10_02_38.vma



It's uncompressed. First borg backup with --compression zlib,6 sends ~ 2,7GB to remote site. That is good.



Next day, we have two files in the directory. Almost no changes between the files.



-rw-r--r-- 1 root root 5.5G Feb 19 10:36 vzdump-qemu-202-2020_02_19-10_02_38.vma

-rw-r--r-- 1 root root 5.5G Feb 20 10:36 vzdump-qemu-202-2020_02_20-10_02_38.vma



Now, borg sends _again_ the complete ~ 2,7GB of the new file to remote site. Why?



I would expect that _at least_, not all again, will be transfered.



Am i doing something wrong?



Thank you.



Stefan
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