A standard URLSession can work from the background you just have to ensure that the app isn’t suspended while that work is in progress.
Thanks for the clarification regarding the URLSession and the background execution. I've found different information about this.
I think we will use a mixture of both ways. For the initial synchronization we'll use a background session task and for the subsequent synchronization simply a BGAppRefreshTaskRequest. Since these only need to retrieve and process data since the last sync.
Lars_
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