I use rsync.net, it’s not as cheap as some, but I like the simplicity of storage I can access with rsync, rclone, sshfs etc.

You can run some commands remotely too, so I used rclone to copy my OneDrive files directly from the cloud files to rsync.net. Not through my PC.

Some travel routers have a USB socket for media.

They’re usually used to make connecting to hotel Wi-Fi easier (you connect your devices to its ssid, then connect to its admin page and connect it to the wifi, or just plug it in to the lan).

Tp-link ac750, for example

https://www.tp-link.com/us/support/faq/340/