There is a new firmware update available (v2.31.163) through manual update. You should update the firmware version of My Cloud EX2 Ultra with the latest version in this concern.
@Brandon.P, I am aware of this version. If you take a look on the announcement page, you’ll see that this issue is also discussed there. Manual upgrade to this version does not solve the backup job creation issue on many devices. For now I downgraded to 2.30.196 and everything works great.
I also opened a case [REMOVED DUE TO PRIVACY POLICY] and uploaded all logs there.