[hnwizard]

As per the mobius sync FAQ:

"No iOS app can run continuously in the background. This means that Möbius Sync can only connect to other devices whilst the app is open, for a short time thereafter, and whenever it is triggered to run briefly in the background."

[EGreg]

Yup that last part is the entitlement !

[hnwizard]

It's such a brief amount of time, it's impractical for it to do something useful during that time, like sync a file.