Migrate from 20.1.9 to 21.1 best pratices ?

[flexi.man]

Hi

I would like to know the best practice for migration , from 20.1 to 21.1?
In place upgrade 20.1 --> 20.7 --> 21.1 or backup configuration from 20.1 and make new install 21.1 and restore backup configuration.

Thanks for your answer.

[chemlud]

20.7 saw a major shift in the underlying OS iirc. I would backup, install fresh with config.xml imported...