Look into a small Monolithic Dome storage building for your backyard. It doesn't take up much room is pretty darn strong. I have been researching these things (domes) for years. They are pretty strong and easy to put up what you need for purposes of storage/shelter. http://www.monolithic.com

Standard Disclaimer: I got nuthin' to do with these guys financially, familially, or anything else.
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor