Upgrading grafana from 7.3.3 to 9

I want to upgrade grafana from 7.3.3 to atleaset 8.5
will it effect my existing charts?
please let me know how to take backup ?
do i need to take grafana db backup mysql?
how to take charts backup?

@pushpapatil

The upgrade documentation includes recommendations for backing up your database which would be the same steps you’d want to take before migrating: https://grafana.com/docs/grafana/latest/installation/upgrading/#backup