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DropBox knows how to copy around data, but it doesn't know how to resolve conflicts when data is edited in two places before being synchronized.

OmniFocus does know how to do this, so if you want to avoid potential data loss when resolving conflicts I strongly recommend using OmniFocus' built-in sync facility rather than using something else to try to synchronize your data. OmniFocus understands how to sync its data through the cloud (via MobileMe or WebDAV or a file server), through the local network (via Bonjour), and through portable drives (such as USB sticks).