You have very few options here:
1. Pay (I don't recommend it, u will be held at ransom all your lives)
2. Use ur backups
3. If 2 is unavailable, recover from offsite non current backups if available

You will survive this. We did.

It didn't help tracking the guys down on the dark net.

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Kevin Njoroge
+254714352738
http://about.me/nknkevin