When setting up a new snapshot for a subsite, I'm not clear if I should select this option: " Include common files: Media (wp-content/blogs.dir/323/files)"
I looked at the files in this folder and they are mostly images used in building this subsite. They are not common to other sites.
So what is a common media file? And will they always be found across all subsites?
And if I need to restore a site, is is necessary to have all the files and not just the common files saved?