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How to dedup existing rsnapshot on ZFS?

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I have a backup box using ZFS (on Ubuntu 20.04 LTS) where I use rsnapshot to back up a number of websites. These websites have a fair amount of duplicated data.

I have just enabled de-duplication of the ZFS volume, but I am at a loss as to how to de-duplicate the existing data - specifically as rsnapshot uses hard links, I don't know how I can rewrite the existing data to force deduplication to kick in without messing up the snapshots.

Can anyone advise of a suitable method to de-duplicate my existing data?

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