QNAP unforgivably uses a proprietary version of ZFS with their own extensions that are not compatible with mainline OpenZFS. It can only zfs send/receive to other QNAP devices. While your data is protected like any other ZFS system, it is _NOT_ interoperable. You can not take a zpool out of a QNAP system and access it on another system with ZFS. I discovered this painfully the hard way, and won't buy from them again, unless I plan to wipe the software and run something open.