I use gnu stow and my self hosted got forge to manage and back up my config files. With a 3-2-1 backup strategy on the gitforge of three copies, at least two mediums, with one offsite.
Gee. Look at the fucking cops protecting the oligarchs and their property instead of the rights of the people being illegally detained, deported, arrested, etc...
I don't use AI at all. What you described is the principal reason. I also don't like how these giant corpos are sucking up the entirety of human output to train these models without a care to the implications of it.
I don't know of Amy open source projects that do this, but if you're at all comfortable with bash (or another scripting language) and a little self hosting you can roll your own with Olivetin, which is what I did for all my personal data tracking.
I have it running on a raspberry pi zero w and access it through the pwa.
I self host vaultwarden and its great. Its an easy self host, and in my experience, it has never gone down on me.
That being said, my experience is anecdotal. If you do go the vaultwarden route, realize that your vault is still accessible on your devices (phone, whatever) even if your server goes down, or if you just lose network connectivity. They hold local (encrypted at rest) copies of your vault that are periodically updated.
Additionally, regardless of the route you take you should absolutely be practicing a good 3-2-1 backup strategy with your password vault, as with any other data you value.
If you go with Wayland, use Hyprland. It's pretty easy to find configs for Hyprland on github and/or tutorials on YouTube. I watched a few YouTube tutorials to get an understanding of how it works and then adjusted the base config to my liking.
If you're using x11, there are more window manager options to choose from. I have no recommendations there, but I know i3, DWM, bwspm, and openbox are all popular and should have tutorials and configs readily available to work from.
Another for radicale. Been using it for years now. Its great.