I interpreted @carlbeech to mean they wanted to “duplicate” on-site backup in the server backup original location onto “off-site storage” (USB drive). A “backup of the backup” so to speak.
I searched through the posts. The nearest I could find to my interpretation, if that is the case, is the following reference:
It sounds “promising” to extract certain folders onto an offsite storage device. Then if needed put those extracted pieces back where they belong.
your interpretation might be different. But it might point you in the right direction.