Well, another advantage that 7-zip has is in the update mode (CLI); unlike WinRAR, it can handle deleted files as well. So it lets you make proper differential

Well, another advantage that 7-zip has is in the update mode (CLI); unlike WinRAR, it can handle deleted files as well. So it lets you make proper differential backups (snapshots of a folder, for instance), recreating the original state when restoring.