Last  year, I moved my backup server to ZFS storage. That's great. But
  it's not so great that it runs Arch with its frequent updates.

  Right now, I can't even build the  ZFS  module  (actually,  it's  SPL)
  because  the  build  breaks with GCC 7. It looks like it's easy to fix
  [0], but hey, that's my  backup  server,  I  don't  want  to  run  any
  experiments there.

  Hence,  I'm  now  switching  to Ubuntu 16.04. :/ I thought about using
  FreeBSD, but for maximum compatibility with both ZFS on Linux  and  my
  legacy Linux software RAID, I eventually chose Ubuntu.