It's interesting to compare with QNAP, a competitor of Synology, that does not use Btrfs (they stick to ext4 with mdadm) and they explained why: https://www.qna

It's interesting to compare with QNAP, a competitor of Synology, that does not use Btrfs (they stick to ext4 with mdadm) and they explained why: https://www.qnap.com/solution/qnap-ext4/en/ https://www.qnap.com/solution/qnap-ext4/en/ However, I am really not sure if the facts they provide are still relevant today. Like always with commercial documents, that must be taken with a grain of salt.