How to restore the data to another influx instance

InfluxDB 2
1

I backup the database of my influx instance A and want to restore it in my influx instance B
I read the Documentation and set "influx setup --token “A instance rootToken” in my cmd
But Cli returns an error: Error: instance at “http://localhost:8086” has already been setup
So how to restore the data in a different influx instance?
Thank you