how to clone a btrfs filesystem

[Christoph Anton Mitterer <calestyo@scientia.net>]

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Hey.

I've seen that this has been asked some times before, and there are
stackoverflow/etc. questions on that, but none with a really good
answer.

How can I best copy one btrfs filesystem (with snapshots and subvolumes)
into another, especially with keeping the CoW/reflink status of all
files?
And ideally incrementally upgrade it later (again with all
snapshots/subvols, and again not loosing the shared blocks between these
files).

send/receive apparently also works for just one subvolume,... and
documentation is quite sparse :-/


Cheers,
Chris.

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