I use webdav on my VPS (running Debian / Apache) for syncing my keepass vault, 2FA vault, and specific files (including vehicle/generator maintenance logs) across my devices. Obviously, everything is encrypted up the wazoo (well… maybe not the generator maintenance log) - and backed-up (admittedly to GDrive, but it uses a 12kbit key, so have fun decrypting it).

I am, however, of the opinion that not having any sort of digital footprint can appear very suspicious, so I maintain a completely normal-looking-and-innocent collection of contacts, calendar, tasks in my GMail.