Not so if Apple shuttered iCloud for good. So even if something catastrophic happened to all of us at The Omni Group and the server cabinet bill wasn’t paid, you’d still be able to continue on. (Note, though, that the one thing this doesn’t work with is OmniFocus for the Web.) On a computer in your basement, on an Amazon server somewhere, or some Raspberry Pi in a cupboard in a shed. If you want all of your data under your control, you can set up your own WebDAV server. When we developed Omni Sync Server and OmniPresence (as a feature), we wanted to focus on three things: open-source technologies, portability, and longevity. There’s a big advantage to using Omni Sync Server and OmniPresence, though. But that doesn’t cover everything, like OmniFocus syncing. You can use iCloud for syncing files using Document Providers, a global file picker introduced in iOS 8. There’s more, too: read all about Publishing and Subscribing. In OmniPlan Pro, we sync your entire plan and all its changes so that you can collaborate with others.
The Omni Sync Server is a completely free way to keep your Omni applications in sync with each other.