BTRFS deduplication

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Hi again list,

I've seen in a message dating back to january that offline deduplication
has been implemented in BTRFS, but I can't find it in my btrfs-tools
0.19+20100601-3ubuntu2

Has it reached release, or not yet ? How could I give it a try ?

I've seen a discussion about whether deduplication should be made
offline or online ; my usage case it to backup a number of laptops
having all about the same software and many files in common, to a single
backup server using rsync, I would be very much interested in online
deduplication - because I don't have "n" times the storage space, that
offline dedup might temporarily need, and because performance isn't
crucial for this application, as backups can be done overnight...

Thanks in advance :-)

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