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. 
There's really a risk, that is why you should first educate yourself first how to protect your bitcoin from being stolen, and about the price bitcoin never drop to 50% of its value whenever there's a crash the value always regain and correct itself