I recently started doing this. I'm using GNU Stow plus Git to maintain my dotfiles and scripts (one thing I do in scripts is check uname to decide if its macOS

I recently started doing this. I'm using GNU Stow plus Git to maintain my dotfiles and scripts (one thing I do in scripts is check uname to decide if its macOS or Linux). You could use Gitlab, GitHub, or host your own Git (e.g. reachable via WireGuard). Furthermore, I use Topgrade [1] to maintain most machines. It abstracts Homebrew, APT, Vim Plug, Pip, Cargo, and a plethora of other software management tools. I keep a spreadsheet to write down changes I make on a system, and then allow myself to cross which machines also have this change. This all works well for me, and my Macs have TimeMachine, which is synced over WLAN at home network. However my Linux machines don't have such luxury (referring to the UI here). So you might want to look into a Linux alternative for that, or use a system with that in mind such as Btrfs, ZFS, or indeed (as per other comments) NixOS. [EDIT]I'd like to add that some of my (virtual) machines -such as for example the ones running Kali- only have read access to certain Git repositories, and no access at all on other.[/EDIT] [1] https://github.com/r-darwish/topgrade https://github.com/r-darwish/topgrade