Jaz drives do have a spotty reputation. Whether or not it's well deserved, the mere fact of its spottiness suggests that reliance on Jaz disks for backup may be somewhat riskier than perhaps you'd like. I'd recommend supplementing the Jaz with a CD burner. Use good media (e.g., Verbatim or Taiyo-Yuden), store in a dark, cool, dry place, and you should be able to read your discs well beyond any realistic time window.