To piggyback on the permissions hissy fit-
My aar stack, openmediavault, and transmission stack have different usernames mapped to the same uid and it is a pain in the ass. I "fixed it" by making a NAS group that catches them all, but by "fixed it" I really mean "got it working"
So be aware of what uid will own a file and maybe change it to a uid in the 1100+ range to make NFS easier in the future.