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It says
View, sync, and refine using our apps
And also:
Access, sync, and store files with cloud storage services
They only list Google Drive, MS OneDrive, and DropBox.
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Officially. But there's a huge hacking community around it where you can self host the syncing service.
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This.
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Isn't this the one based on Linux?
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Yup. There's a whole enthusiast community around it with plugins and stuff.
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