How can I transfer localer calendar data from RPi4 to Rpi 5?

My attempts to transfer the data from Rpi4 to Rpi5 using backups (GoogleDriveBackup and Internal) all failed. The system was always completely unusable after the backup.
Now I have dragged the required files over one by one. This works now.
Problem: This doesn’t work with my lots of calendar data.
I can’t find a file containing my appointments.
Does anyone have an idea how I can get my 4 calendars from the RPi4 to the Rpi 5?


Has no one tried this yet? Nobody has an idea?