++ I liked the overall technique you've used here. Here's a few thoughts:
"... restore all modules in minutes ... " - I question the time you estimate here; although, as I don't use cpanm, I'm happy to be advised otherwise.
Is there a reason for sort in the 1st line? I might have used: s/sort -u/uniq/.
The output from the 3rd line is likely to be quite lengthy. Consider adding > /tmp/pms_out 2>&1. You can use tail -f if you want to view the output and you have a full history if anything goes wrong.
Update: s/is you want/if you want/
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