Larry,
I have the same issue as you.
I use the:

 Maximum Volumes = 30

in the pool to force it to start recycling volumes when it reaches
this limit, rather than let the space run out.

I'm not keen on the solution, as it's a fine balance between ensuring
that it has enough volumes to complete the backup, and make the most
use of space also, but it does the job for now.

There are commands to purge old volumes to recover the disk space, and
some others here have scripted this to happen automatically, but I've
not tried that.

Dermot.

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