Best place to locate a python routine called from a dialplan

FreePBX 13

Quick question: Where is the best (most logical) place to locate (i.e. directory) a python routine called from a dialplan with the TrySystem command so that it gets backed up with the freePBX backup routines?

I’ve put it in /var/lib/asterisk/agi-bin/ but I’ve read that is not backed up.

Thanks
Alan