Is the cloud server waking up my WD Cloud every 25 minutes?

[bjoern]

Yes, you are right. “wdmcserverd” and “wdphotodbmergerd” are related to photo indexing and snapshot creation, see  http://community.wd.com/t5/WD-My-Cloud/before-you-pack-up-your-WD-and-return-it-let-s-talk-about/td-p/683307/page/4

Edit: Those two services do not exist on “My Book Live Duo”.