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So I have a 16 GB iPad Air (I know probably should have opted for larger storage at the time of purchase). Every so often my device slows down and the settings app indicates that I have used 11 GB and have 1.7 remaining, or something along those lines. I never really thought much of it until one day I ran out completely. Keep in mind I only have a handful of apps on my device, so my curiosity set in and I decided to add up the storage used by each app.
What I have found is that 11 GB has not been used by apps, the tallied total came up to 6.7 GB. Where is the other storage at? I am able to recover the lost space by restoring my iPad from a backup but doing this every two months seems a little excessive. Am I missing something? Is there some sort of garbage collection that I can be doing to eliminate this issue?

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