Perhaps someone could offer a related suggestion. At the moment, I use rsync to backup files to external hard drives. One of the difficulties that I run into

Perhaps someone could offer a related suggestion. At the moment, I use rsync to backup files to external hard drives. One of the difficulties that I run into is that some folders I want to mirror exactly between my computer and the backup. Other folders I want to only add files, but not delete, to the backup. Still others, like git repositories, I'd like to bundle rather than backup the directory itself. Finally, I make redundant backups to multiple external hard drives, so it would be nice to replay the same backup procedure to multiple devices. Does anyone have a workflow that accomplishes this or something similar?