we use legato networker to backup our infrastructure.
We also use a disc for incremental backups and as kind of 'backup buffer'.
Our data goes to the disc and then we stage it to tapes.
On last week of the month we clone the desired data from tape to tape, changing retention and browse times as desired.
So now, we have a problem. One Tape drive from the library is just gone. This means that we are going to have a big trouble on the last week of this month if we do not fix it.
I attach an image for better understanding.