RClone (http://www.rclone.org) is a command line utility which enables to copy and sync data from and to famous cloud storage providers.
The utility is available for Windows/Linux/Mac and supports majors cloud storage providers like: Google Drive, Amazon S3, DropBox, Backblaze B2, etc.
Copy a file to remote cloud is simple as rclone copy c:\myFolder\myfile.txt remote:\backup or synching a folder
rclone sync c:\myFolder remote:\backup
Sync doesn’t transfer unchanged files, testing by size and modification time or MD5SUM.