TBH the XFRocks addon is not a good example. It caused a lot of trouble. Its best to use the XF2 functionality. However, due to changes is hosting costs bandwidth and diskspace are much less of an issue than 2 years ago. Bandwidth is free for those who use CloudFlare, etc and diskspace is extremely cheap on hosts like Amazon, Vultr, DigitalOcean. I'm not sure if this functionality is important. Its not important for me anymore.