A Microsoft file hosting and synchronization service.
Option 2 does not work. I am using OneDrive installed on my computer and trying to use the search bar in File Explorer and it returns nothing. It does not work at all. I can type in the exact file name and it will return no results. OneDrive and file searching is obviously broken and has been for months. Come on Microsoft, this is a ridiculous problem to leave broken for this long as it destroys the functionality of file searching for those of us who migrated all our files into OneDrive. This is how competing products start to beat you in the market place. A previous poster has already noted he mirrors to Google Drive which solved this problem. If Google drive gives him this functionality and OneDrive does not, how long do you think he will keep using both products?