I make copies of gta one on external disk and another on my laptop- just in case, cuz I’ve spent a lot of time modding and configuring everything and don't wanna lose everything. Every time I change something, I update the copies. Unless someone installs huge mods like LA Revo or NVE, I don’t think backups for re-modding are necessary. I also always check what .OIV mods actually change before installing them so they don't replace my already edited files.