I recommend FSArchiver, it can handle different size partitions

For me: uploading single file using their client ~25MB/s, downloading ~50MB/s (30-60MB/s). In newer versions of their linux client it’s possible to mount filen as network drive or to start webdav/s3 server.

Install Termux and run sshd -D -d -p <port>

You can mount remote with rclone and fine tune caching to your liking: https://rclone.org/commands/rclone_mount/#vfs-file-caching

Grab live cd and run it in qemu:

qemu-system-x86_64 -enable-kvm -machine type=pc \
-cpu host -smp 2 \
-m 4096 -device virtio-balloon \
-vga virtio -display sdl,gl=on \
-usb -device usb-tablet \
-boot d -cdrom "$@"

https://github.com/89luca89/distrobox/blob/main/docs/posts/run_latest_gnome_kde_on_distrobox.md

It depends on how much cpu power, disk space, ram, side databases, backup space, etc. you need. Once you know all of it, just compare prices. Check also hetzner, scaleway, vultr, digital ocean, ovh. Good luck 🤞