I am using a dedicated private server on our LAN to migrate a small D6 website to D7 and eventually to Backdrop. So far I have partially migrated from D6 to D7 and am ready to start thinking about installing Backdropcms on this same server.
Given the headaches incurred in the D6-D7 port, I'm not sure whether it makes sense to try to convert D7 to Backdrop or simply recreate site content from D6-Backdrop via copy-paste, but in either case I am wondering if it is advisable to attempt a co-located multiplatform migration like this on a single server.
Specifically, the o/s is Centos7 and the existing root site path is /var/www/html/drupal6 and /var/www/html/drupal7 for D6 and D7, and I was thinking of using /var/www/html/backdrop for the Backdropcms install. Is this the recommended approach or can anyone point me to references for a better alternative?