[App_rpt-users] DIAL update restore configs question

I have copied my entire /etc/asterisk folder. When I re-image the hard drive, how best to restore the custom conf files.. The question is how best to maintain configs for a possible re-image. There is a "include custom" statement at the bottom of most conf files. Exactly what is expected as a custom conf? The entire config, but with user changes? Does the template conf run and then the exact same customized conf file? This has not been explained in much detail. I COULD copy the ENTIRE SD contents after any ssh change, but that MIGHT also capture any hacked-but-dormant changes. More experienced administrator comments are appreciated. 73, Duane KA1LM