Continuous activity on both drives even if not accessed for days

[NOTR82]

Are there a lot of videos and pictures among the files of your backup?

If so, they cause the convert process to run the cpu at 100% for days…

See here: 

http://community.wd.com/t5/WD-My-Cloud-EX2/My-CPU-at-100-quot-convert-quot-process/td-p/721430