Go onto their website and download it.
Answer:
All the data and information that was updated or added since then will be lost so it is useless to restore a Domain Controller that was backedup twelve months ago.
Explanation:
A domain conttoller back-up must be prepared on regular basis else if DC breaks, restoration of most recent database will be impossible.
Answer:
research the question and go to setting and press advanced search and it will give answer