[Borgbackup] merging repositories

[Thorsten von Eicken]

Is there a way to consolidate archives from multiple repositories into a 
new repository?

I've been backing up multiple systems each into its own repository for 
several years and I'd like to create a consolidated repository for 
archival purposes. The reason for consolidating is deduplication because 
it turns out that I've moved large directory trees from one system to 
another over time. I would continue adding archives to this consolidated 
repository, but at a slow scale, e.g. monthly, so I'm OK with the cache 
synchronization overhead and with ensuring that only one system creates 
an archive at a time.

I have the feeling that right now the best I can do is borg mount an old 
archive and then run a borg create against the mount point. Is that 
correct? It would be cool if I could pipe borg export-tar into borg 
create, but that doesn't seem supported. Is there another option I'm 
missing?

Thanks!

Thorsten

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