I think Bitcoins saving is quite risky, because compared to other forms of investment such as gold or dollars, cryptocurrency is more risky because the possibility being hacked is so high, we could be stolen bitcoin or the ability the network system attacked, you lost all bitcoin in the second. In addition,fluctuations in bitcoin price are highly impacted by the market so investment in bitcoin is unsafe solution. 
Oh Dear, please, please read around the forum before posting such stupidity. What do you mean network system attacked? Do you have any idea what you are talking about? Maybe what you heard about people losing their bitcoin is (1) they put their funds on a exchanges, so when a hacked happened on that exchange, your money is gone, (2) you didn't protect your wallet, - password is not strong, or you give your private key to someone untrusted. Fluctuations is part of the nature of bitcoin, If you don't know how to handle fluctuations, you shouldn't be in bitcoin investment. Bitcoin price is based on supply and demand, so its another factor that you need to understand before talking about fluctuations, volatility and unstable price.