Gdrive -> Gdrive

Guys, what’s the fastest way to transfer files between d Google Drives you have ownership of?

Secondl, I have a seed box that I can’t install new programs o n. (No root). I can however remote desktop and get access on a browser, I can shell in and also have sftp access. I’m wondering with that access is there a way for me to transfer files directly from the seedbox to my Google Drive? Would a mounted drive on my computer then fxp between that drive and my seedbox cause the transfer to go direct or would my computer still download it first?