This should be easy, but apparently it's not.
I've searched hi and low for a procedure showing how to run a backup, and eject the tape used in that backup. I understand the "eject tape" checkbox doesn't apply to libraries. All of the doc I've found only seems to go that far, never to "...instead, you have to do this, this, and this".
I have the I/O station enabled (after hours of searching to realize the I/O station does not mean the tape head), and I have gathered that I need to use Import and Export, but I can't find details on HOW exectly I use those functions.