I can't get this to work for me. I'm sure it's because I know nothing about perl, so there is something I'm missing. I think terminal still launches for me with a tcsh shell, and this script may be for a bash shell. In any event, something's amiss whenever I try. Pity, I really want what this script offers.

Particularly frustrating in that the immediate comment after the hint says it is immediately executable without any changes.

But my purpose here is to say thanks for the tip on TimeTracker. I tried it, and in 30 seconds I had the long-sought answer to why my Time Machine has been saving gigs of data when I have done little to nothing since the previous backup. That's all I wanted, and I got it here in this tip, if indireclty.

See the comment below: good summary for non-terminal types.