@Sinan İŞLER - The plugins at Tools->Import are purposely "core" plugins. By having them as modular additions, it is easier to update then if services change their export format or new players come on the scene.

Backups are more of a hosting and/or site ownet job, as if you need to return to a backup due to malware, etc, you'll likely want to wipe clean and cleanly apply the backup. Not typically something you'd want to do within WP.