A folder of logo files is not a brand system. The difference shows up about six months later, when a new hire designs a slide, a supplier prints a banner and a marketplace uploads a product image. If three people produce three different looks, the problem is not their taste, it is that nothing was written down.
Write the rules, not just the files
A usable system states clear space, minimum size, approved colour values and the type scale. It also states what is not allowed, because most real damage comes from plausible-looking mistakes: a stretched logo, a logo on a busy photo, a colour pulled from a screenshot rather than the palette.
Build templates people can fill in
Templates should be locked enough that a non-designer cannot break the layout and open enough that they do not need to call you. That usually means fixed type styles, defined image frames and locked background elements, with clear editable text areas. A template that requires judgement will be avoided or misused.
Name files for the person searching
File names are part of the system. A structure like brand-logo-primary-print.ai tells a supplier what it is at a glance, and separates final files from working copies. Keep a single folder that is the source of truth, and let everything else be a copy.
Review it once a year
Systems drift as products, platforms and people change. Once a year, spend an hour checking whether the written rules still match what is being published, then update the document rather than the individual files. That one hour prevents the slow accumulation of exceptions that eventually turns a system back into a folder.