There are Linux clients for MS OneDrive and Google Drive not only for this old, low storage capacity (I mean free) services just to mention the biggest ones. Not in the repo, but you can build yourself and try.
You can have your own VPS also for $5/month with 20GB storage with your own LINUX and you can use rsync, sftp, webdav or what ever you want instead of these giants. I can give you a $10 coupon if you want to try free such a VPS