Some documents are just more important and delicate than others. These are the type of documents that, when lost or damaged, might lead to losses in your company. One type of such documents that I could think of are contracts with your partners or clients in the business. These documents have to be protected very well or this may result to complications you wouldn't want to have.
While having duplicate copies is still the best way to go to protect your interests, they only serve as your last resort. This is no excuse for you to just store your contracts in a very unsafe place that is prone to theft or severe environmental conditions. For this reason, I recommend this polysheet document protector from Easi File.
Much like shelves but less hard, these polysheet document protectors are antistatic polyethylene envelopes that will keep your documents safe and sound. Maybe it is rather quite odd to store your documents inside polyethylene envelopes instead of simply putting them inside a shelf, but this might subject them to mixing along other less important documents, and might result to them being lost. It has a multi-compartment storage that allows you to separate documents based on their categories, and they can be hung from a single hanger strip. Best of all, these document protectors are more portable compared to the conventional shelves. Because it is lightweight, it's easier to carry these documents around with you.
It may look like an odd way of protecting your documents, something that is unlike to what we've been used to--but if it will make document-keeping better, then why not try it?