Netflix has stepped up its efforts to ban VPN and proxy users from bypassing geographical restrictions. The streaming service is now blocking residential IP addresses too, since some unblocking tools use these to bypass restrictions. This isn't without collateral damage as many regular Internet user...
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ZFS can do all that, and more. You can pretty much set an arbitrary parity level when creating your zpool, though obviously this will decrease available storage capacity accordingly.
ZFS is also more mature than btrfs (the next-gen Linux filesystem), but is less well integrated with Linux - runs great, works perfectly, but tools like gparted don't understand it and it's slightly more complex to set up. There's also stuff like XigmaNAS as a more turnkey alternative to Unraid.