GMod Backup with SVNs doesn't work

I decided to do a clean installation of GMod. When I tried to restore a backup I had that contained SVN files, maps, Adv. Dupes, etc., The GMod folder in the /common/garrysmod/garrysmod/addons/ didn’t show the SVNs or anything, only the addons I had installed on the workshop. Did I do something wrong? I’d really appreciate it if you could help.

(NOTE: I tried to get help with a ticket on the facepunch help website, but it hasn’t been checked out yet in 12 days. Is that normal?)