The primary site server is responsible for grabbing the source data and turning it into packages for Distribution points. so while you can use ANY UNC to be a source location for content, you should be aware of where that content exists in regards
to your primary site server. If your source content is in Montana but your primary server is in California ... there's going to be a WAN hit ... even if the DP it's destined for is also in Montana.
Second, I strongly recommend locking down your source UNC path so that only the servers and SCCM admins can access it. This will prevent side-loading of content as well as any "accidental changing" of folder structure that could cause
your applications/packages to go crazy.
Put the two together and I typically recommend you create a DSL (distributed source library) share and slowly migrate all your content into it as you create your packages/applications. You can then safely create batch installers, manage content versions,
and other things without fear of someone running something out of context.
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Edited by
Justin.King
11 hours 23 minutes ago