On Fri, 17 Apr 2015 11:08:44 PM Christoph Anton Mitterer wrote:
> How can I best copy one btrfs filesystem (with snapshots and subvolumes)
> into another, especially with keeping the CoW/reflink status of all
> files?

dd works.  ;)

> And ideally incrementally upgrade it later (again with all
> snapshots/subvols, and again not loosing the shared blocks between these
> files).

There are patches to rsync that make it work on block devices.  Of course that 
will copy space occupied by deleted files too.

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