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

Configuration
1

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?

Thanks

2

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