As one who is in charge of the filers for all data for a military base of 10,000+, you will need to sit down and prioritize the servers in which you have in your server farm. Of those servers, which ones are most critical and do you have a coop site. If not, that will be your first major hurdle.
As to storage filers, you should, MUST, always have a backup of those filers off site, if not, you are breaking a very big taboo for backing up data. What happens if there is a fire, and your backup filers are sitting right next to the primary filers? Not a smart move. That is why they say to always have your backup tapes stored off-site.
Lastly, at least once a quarter, do a practice run of your disaster recovery plan. Not on the entire server farm, but one section at a time. You do not want to wait until something major occurs and find out that your plan did not cover a certain section.