Hi,
My use case is the library of video assets that is constantly syncing from GCS (whole bucket) to local clients' servers with Minio client mirror command. Thus the size of the library is critical. Before uploading to GCS store, files are processed in Sidekiq with ffmpeg, and originals are kept in cache (we don't want to blow up the library). Would be nice to have some hybrid of `backup` and `delete_promoted` plugins, so that originals would be backed up from cache to separate store and then deleted, after processing.