Sever Backup problem in Version 8

I’ve just upgraded to V8 on two PCs. On V7 I had an automatic daily backup set on both PCs for 8AM and it always worked fine. Now on V8, the auto backup doesn’t run on one PC and now a manual backup doesn’t work either.

I’ve checked the backup settings (and schedule) in eM Client and also checked in the Windows 10 Task Scheduler. Everything is as before but I don’t get a backup!

Any (all) ideas are welcome.