I was expecting FA data base have a back up similar to RAID 1, aka real time back up. Even if the site is not backed up in real time, 6 days/weekly seemed a bit too long for a website, especially the ones like FA which had been attacked quite often due to it's contents. A daily, bi-daily, or tri-daily back up would sound more reasonable.
Some people just do this for fun or as a challenge.
Some people want to sell the data, others hate the content so much that they simply want to destroy it.
Some people want to find users to take a ransom from.
The reason of the content deletion is probably just that the attacker(s) wanted to remove as much evidence as possible.
Deleting everything makes finding out what actually happend much harder.
Sometimes they do it just because they have nothing better to do with their lives.I don;t get it...whats the motivation? Its clearly not cash otherwise they would have demanded a ransom or something. Why would they devite time to fucking with your website? Its stupid AND cruel to the users.