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. 
I don't think you have proper knowledge of what u are stating here. Bitcoin is very safe and hacking and stealing your bitcoins is not possible until you don't protect your wallet with a password or you gave your private key or pin to a person who cannot be trusted otherwise there is no chance. And fluctuations in bitcoin or cryptocurrency normal as if the price would be stable then there is nothing left to invest as there would be no profit or loss. But , if the price is going up and down that there is a good chance that you would get good profit out of your investment.