Add source for third party addons……..sorry if a silly question.

Ok bare with me here…….and sorry if a silly question.

To add a third party repo I add the source first then download from zip then open from repo………..once I have my addon, and to save space on the hard drive I always go back to file manager and delete the source file.

Is this ok to do? It doesnt screw with downloads or updates for the addon since that has already been downloaded correct? Or do I need to maintain the source file under file manager always?