While there has been a lot of bad reporting on this, Google Drive is not simply being canned, it is being replaced by “Backup and Sync.” So what does that me to you? If you don’t use Google Drive, it means nothing. However, some of us do use Google Drive and need to know what exactly is going on. PC World has some answers for us.
The major difference between Backup and Sync and Drive File Stream is the latter’s ability to stream files from the cloud—the popular “placeholder” capability that can display copies of all of your cloud-based files, without actually storing them on your PC. (Placeholders will be a feature of Windows 10’s Fall Creators Update as OneDrive Files on Demand.)
Backup and Sync syncs files more traditionally, placing local copies on your desktop, and then backing them up in the cloud. If you want to back up your photos and videos, you’ll use Backup and Sync. Ditto with a generic USB drive that you want to add to the cloud.
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Source: [H]ardOCP – Google Drive Changes Coming Soon