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The Sync job will call Digizuite and get changed/updated/removed assets since it was last called. Then, it will remove those assets from cache - as well as alert other Episerver front-end servers to clear their cache for those items.
This is a fairly lightweight job and can easily be configured to run very frequently (every few minutes - or even every 30 seconds).
This scheduled job activates the GetListItemChanges method on the Digizuite Client object. This in turns sends off a request through the Digizuite SDK to perform the search on Digizuite called "GetModifiedAssets", which then retrieves a list of assets that have changed and should be removed from cachea list of all assets published to the Episerver channel and then i will start deleting all blobs save to Episerver blob storage. This job is usefull when you are switching between DAM centeres on the same Episerver instance.