Hello!
I did a lot of work to fix the 30.12.1899 issue in Windows Backup and restore, and could not find any help. Finally I disabled the Internet Time Synchronization, and the correct Backup schedule stayed there!
So, IŽll wait the fix but have no pain because the scheduled Backup and restore is working, I only have to set the correct time manually, think 2 - 3 times per year.