You can also consider hosting it at home. More than likely you've got fiber at home, with decent capacity, and you need (1) closet (2) UPS (3) static IP from ISP with a decent firewall/router. It's not ideal, but a lot cheaper and could be perfect for what you need.
I've installed Syncthing (https://syncthing.net/) on my phone(s) and it syncs selected folders directly to my Synology NAS at home. As Syncthing uses its own discovery system, there is no need to open anything up to the internet.
Starlink, no public IP. A bouncer has been suggested and I'm gonna look into that, cause I do have tons of compute capacity and sufficient bandwidth to handle my cloud document needs lol
