Encrypting boot drive after OS installation

What would be the best process for encrypting the boot drive after OS isntallation?

I know you can encrypt the boot drive during install but I don’t see any documentation mentioning post installation.
Is this possible?

I would backup and reinstall, but if you want to give it a try, you could follow encryption - How to encrypt an existing disk on Fedora without formatting? - Unix & Linux Stack Exchange
Make sure to have a backup!

Thanks.

I assume this would also apply to XFS file system?

What backup would you recommend?
I mostly use clonezilla to backup the whole drive at this time.
Is there something intuitive that will back up all the user settings and configurations/installed applications?

I have a whole Ansible play book at the moment, but I only use that for new systems.

I just backup my home dir, that has all user settings.

I guess that would have all the configurations and data.

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