If you are putting items in long term storage, it's best to be armed with as much knowledge as possible about the best storage conditions. In many cases you can simply store and forget - out of sight but hopefully not out of mind! But more treasured possessions such as wooden furniture, vehicles and jewellery, might need a lot of preparation from your end to get them fit for storage without the reassurance of an eye on them every day. Many self storage facilities offer climate controlled storage and this should hopefully take the pressure off in some respects, but on the whole if you are doing anything like this you ought to do your research on whether any materials you are storing could be liable to deteriorate and prepare accordingly.