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You can store data for most Omni apps on it, including OmniFocus databases, OmniPlan projects, OmniOutliner outlines, OmniGraffle diagrams, OmniGraphSketcher sketches.

At the moment, the only automatic sync support is for OmniFocus and OmniPlan. You can use the OSS to store your other documents, but you have to request that the app fetch or store the latest copy to/from the server. Nothing new there.

support@omnigroup.com always works for questions if you don't know a more specific place to send them.