An air gap would significantly increase security, but it would also significantly increase the cost of reviewing the sealed documents. I’m unsure how frequently those files should be read, but an air gapped disk storage would make sense for highly sensitive or rarely accessed and sensitive documents.
Pretty much none of the library controllers have options to prompt the user before moving a tape. That is after all the advantage of a _robot_ vs just having a human take it off the shelf and stick it in the drive.
So, no "air gapping" a tape library is called tape export, where the tapes are ejected into a port for the operator to stick on the shelf, or ship to cold storage.
