Openhabian SD Mirroring takes very Long

Hi,
just a short question: I startet SD Mirroring in openhabian-config for the first time. It is running on a RPI4 with 32GB cards.
How long should the initial copy take? I am waiting for 3 Hours.

Everything I see is:

Syncing disks.
Taking a raw partition copy, be prepared this may take long such as 20-30 minutes for a 16 GB SD card

Is there any log I can have a look into?

Kinds
Chris

set debugmode=maximum in /etc/openhabian.conf and try again.
No there is no log.

Maybe I mixed up the SD* devices. Now it is running and debugmode=maximum is showing the progress.

Thanks anyway for the reply!