First off, desktop.ini files have nothing to do with backups. They have nothing to do with Microsoft "collecting"
anything. They have nothing to do with Advanced System Care. Nor, for that matter, do they have to do with the
Desktop, exactly!
desktop.ini files have to do with the directory, i.e., folder, in which they reside! (In that way, they have to do with the Desktop only insofar as the Desktop is a sub-folder in your user directory.)
They define the folder, in that, if there's anything special about that folder, that special information will be found in the
desktop.ini file.
For example, if you look in you user directory, you'll notice that many of the directories in your user directory have special icons. Those icons are defined in the desktop.ini file.
desktop.ini files also tell if a folder is a Document folder, or a Music folder, or a Pictures folder, etc.
In fact, in the Music folder, they go further than that, defining whether a folder is a "MusicArtist" folder, say, for \Music\The Beatles, or a "MusicAlbum" folder, for example, in \Music\The Beatles\Abbey Road.
There are many more things they can define, far more than I could say here, but, no matter what they define, there is
nothing wrong with them, and there's almost no reason to delete them! The only reason I can think of is if you want to remove the special information about a folder or if the
desktop.ini file manages to get corrupted.