Genesis Mining is a legit company that's been around for years now. They're just down for maintenance but will be back up soon. I wouldn't worry about that.
Saying that though, cloud mining has never been profitable. Your contract won't last 2 years - it won't even last one year and you won't even break even in coin terms.
As mathematically proven in here, if you buy a 15Th/s contract and with a 5% difficulty increase each round, you would only receive 45% of the bitcoin from mining compared to just buying bitcoin directly. And that's just with a 5% difficulty increase per round. Over the last 3 months, the bitcoin difficulty increase has been around 11% on average so you would receive even less than 45%. Also, given the way the price of bitcoin is rising, you can expect even greater difficulty increases further reducing the amount you would mine.
So in the future, don't waste your money on cloud mining contracts and just buy coins directly.
@marcusorlyius
Thanks for your comments.
Hopefully the downtime is for service maintenance as you said.
However, if it's planned, it should be announced prior to the happening. If not, it's ever important to make it clear on their other communication channels e.g Reddit, twitter or even emails to their customers. I don't see that happening anyway. Long in the market has no real value in Crypto world. That's my 2cents.
Your mathematically proof is very interesting, and if that's the case, then we should stay away from GM too. Since it's a non-profitable act from Day1, so there is no point to believe in GM as it sounds like a pyramid scam.