Mysql database is deleted by hackers

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I bought myself a cloud Ali ECS, used to practice your hand, mainly learn to deploy, mysql, redis, there are other, mysql database is to do exercises in the code of their own knock, nothing important things, but in the morning immediately after the database is created, after a noon, I saw my database is empty, leaving a few basic library and a please_read_me_vvv

I Buddha, and point to open a look inside there is a warning, as well as a string of English and e-mail address

Brother you are abroad you can not consider the feelings of English slag, asked me to 0.045 Bitcoin, you too highly of me, 3256 ¥ it

Then I changed the password for the database connection password and connection of ECS

I wanted to give myself a convenient figure, let him make a bad result, hateful

Also remind you always pay attention to their data safe, timely backup