btrfs works fine in Synology's implementation. Please keep in mind that RAID is not a backup. You can backup to a cloud service or to a friend's house with its own Synology.
Thanks, I was hoping it would. I understand that raid is not backup. I have two external drives and will probably also use a cloud service for off-site. I was also considering htl blurays for archives, but we'll see. The NAS will become the central storage hub so we don't keep files scattered around on family laptops and smartphones.
