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From: Sampson Fung <sampsonfung@gmail.com>
Date: Fri, 16 Feb 2018 10:43:54 +0800
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Subject: btrfs send/receive in reverse possible?
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I have snapshot A on Drive_A.
I send snapshot A to an empty Drive_B.  Then keep Drive_A as backup.
I use Drive_B as active.
I create new snapshot B on Drive_B.

Can I use btrfs send/receive to send incremental differences back to Drive_A?
What is the correct way of doing this?

Regards,
Sampson