Google has a roadmap which highlights some upcoming features. Copy the files to a different folder, and it gets downloaded to your system. To access your files on the server, you need to open Explorer and click the Drive's network folder which appears as a virtual drive, and browse the contents.
The old program is an offline sync client, meaning it synchronizes the data between your computer and the server, by downloading the content to your local storage. What's the difference between Backup and Sync and Drive for desktop? The change affects all users, i.e., individuals, G Suite Basic and Business users, and Google Workspace users. The program will stop working on said date, and you will be forced to use Drive for desktop to access your files if you want to continue using a software.
Google Backup and Sync isn't going away immediately, you can still download and use it until the 1st of October. Google is advising users not to uninstall Backup and Sync before the transition is complete. A month later, from the 18th of August, Backup and Sync will start displaying a notification asking users to switch to the new sync client. The announcement on the Google Blog states that starting next week, 19th of July, to be precise, Backup and Sync will start offering a guided flow, which will help users switch to Drive for desktop.
