Thanks for the nice words about our product. We do really appreciate them.
Now onto your question - it is right in the spot. Graphite do have a local cache of the files, but it is transient. We always take what's on the server and update the local cache with that version. We do plan to introduce an offline or occasionally connected mode in the future though. You can even vote for this feature on our feedback portal and make sure we do it sooner than later.
Again thanks for your feedback. Keep it coming.
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