2.x version support rclone so using cloud buckets is possible
Support rclone:// URLs for borg repositories
This enables 70+ cloud storage products, including Amazon S3, Backblaze B2, Ceph, Dropbox, ftp(s), Google Cloud Storage, Google Drive, Microsoft Azure, Microsoft OneDrive, OpenStack Swift, pCloud, Seafile, sftp, SMB / CIFS and WebDAV!
https://borgbackup.readthedocs.io/en/2.0.0b11/changes.html#version-2-0-0b11-2024-09-26