Luckily it is fixed. Don't know what was the solution, I've done a factory reset of the OC200 the 3rd time. Setup a new site (now filling out the TPlink cloud account settings, maybe this changed...

@ddtt1024 it is a normal scheduled backup of the configuration which was running monthly. Besides that I did some manual Backups in the meantime I restored my controller back to 5.9 and the Backups...

After the update to the 5.12.9 firmware I was experience some problems with some wifi devices. Because of that I wanted to roll-back to v5.9.32 in order to stabilize my network again. When doing the...