Rclone is a command line program to sync files and directories to and from:

Alibaba Cloud (Aliyun) Object Storage System (OSS), Amazon Drive, Amazon S3, Backblaze B2, Box, Ceph, DigitalOcean Spaces, Dreamhost, Dropbox, FTP, Google Cloud Storage, Google Drive, HTTP, Hubic, Jottacloud, IBM COS S3, Koofr, Memset Memstore, Mega, Microsoft Azure Blob Storage, Microsoft OneDrive, Minio, Nextcloud, OVH, OpenDrive, Openstack Swift, Oracle Cloud Storage, ownCloud, pCloud, put.io, QingStor, Rackspace Cloud Files, Scaleway, SFTP, Wasabi, WebDAV, Yandex Disk, The local filesystem

rclone.org

Whenever you would need to move large and/or many files between cloud storages you should give rClone a try.