Depends on what you're stobors are. Residential fires, living in a high crime area, and earthquakes are reasons to store off site. Floods, maybe. Anything requiring large scale evacuation or bugging in, are going to be hampered by having your gear off site.
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Hope for the best and prepare for the worst.

The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane