Doesn't directly apply here, but remember that the OPP is reset very time that you append to a tape volume, so it you append 3 weeks and two days after the tape is opened (with a 4 week OPP) , you cannot ooverwrite it for another 4 weeks
So,
if you run a job that points to Media Set 1, with a job defined as "Append, Else Overwrite" , backup exec will not append to any of the appendable media?
Or does it append to a volume and fill it up, and still have more data to write? In that case backup exec will ONLY accept an Overwriteable tape.
That is, if you specify Append, backup exec will only append to the first tape volume used. The second, third etc will only Overwrite