You can't exclude offline files at the moment since the full windows folder will always be included.
So if you use offline files for users all these nasty mp3, mkv and so on you excluded before will find their way on your server.
Also it will backup ALL offline files of all users ever logged on this device. Offline files are already mirrored to a server so backing these up again on a Mirage server makes no sense at all.
This is known to Mirage support but their answer was, that I am the first user that has a problem with that s it's no priority for them to give us the possibility to exclude offline files.
Anyone else that has this problem?