If you have an old laptop sitting around, put a linux server or NAS distro on it and start tinkering. There can be a lot of analysis paralysis with this stuff. Sometimes it’s best to just try and fail and learn and try again. More likely you’ll try and succeed and realize other wants and needs and redo it a year later. I think that’s why it makes for a great hobby. Lots to learn and improve upon.

Start small, on your local network. Maybe something like paperless-ngx: not very demanding of resources, and (I assume) easy to backup/migrate. You could see about putting it on truenas to get a sense of what that process is like. I personally like to keep a nas and server separate, then mount the nas on the server.

I’ve found owncloud a bit complex and prefer dedicated solutions. For the seas, servarr apps come up a lot. Paperless ngx for docs. Immich (or ente) for photos/vid. If you’re just starting out, installing on linux and/or using docker is going to be your shortest path to success. proxmox or other VMs can complicate things if you’re not familiar.

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I wanted something similar from a remote company I was working for. They were pretty good about fulfilling requests, but when I asked for a good kvm switch they said they had trouble in the past and instead recommended a usb hub that can toggle between machines. Then connect both machines to the same monitor and toggle the input. Not ideal, but low cost and functional. Might not suit your needs (would be annoying if you have to frequently toggle back and forth), but if you’re just trying to share your desk space between a work machine and personal, and the monitor input is easy to toggle, it’s worth considering.