Timemachine can't find my NAS
PC: new Mac Pro
NAS: DS920+
i bought a new Mac Pro and used the migration assistent to put all my stuff from my iMac Pro to my new Mac. So far so good.
I can see in finder my nas with all my Time Machine backups. But in Time Machine settings, when i try to select a backup disk, it cannot find my nas at all. It only shows me the option for another airport time capsule.
I have really no clue how to add my nas as a backup device, because there is no option in Big Sur to search for one.
How can i select my nas so my new mac can backup my stuff?
Mac Pro, macOS 11.3