Seems that things change, but according to the FAQ, there are still some issues with this matter (know how much Space left and use it)
Il still think that mixing réplication (raid) and file system is a very bad idea.
@martin @hoper There's nothing magical :) it's basically having 2 btrfs partitionned drives, making a snapshot of a subvolume and sending that read-only snapshot from one to the other disk. That prevent us from the use a of a tool like rsync as there's an option to send only the increment when you already have subvolumes on the other drive. Based on : https://btrfs.wiki.kernel.org/index.php/Incremental_Backup
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