Personally, I switched to NixOS to be able to turn any computer into "my computer" via a reproducible and declarative config, and I keep the config in a Git rep

Personally, I switched to NixOS to be able to turn any computer into "my computer" via a reproducible and declarative config, and I keep the config in a Git repository, sync files via Nextcloud, amidst a smattering of other Docker containers on my server. Chezmoi is good for imperative dotfiles too—I keep those in a Git repository too.