Previously I did
sudo influxd backup -database openhab_db /home/openhabian/copy/database/
This created my backup files which I copied via FTP to my PC for backup.
With
sudo influxd restore -database openhab_db -newdb openhab_db -metadir /var/lib/influxdb/meta -datadir /var/lib/influxdb/data /home/openhabian/copy/database
I could place them back.
But, this is not working any more in openHAB3. Maybe different file location?
My backup-problem is solved.
Don’t copy by FTP to a windows system and copy back. Directly copy from the old Raspberry to the new one. The file properties like correct rights will stay in the Linux system.
You can do on the destination system: (use the ipaddr from the origin machine
sudo influxd backup -portable -host <ipaddr>:8088 -database openhab_db /var/lib/influxdb/import
sudo influxd restore -portable -database openhab_db -newdb openhab_backup /var/lib/influxdb/import