It depends on the risk and also the gain actually, Everything got its own risk to it. Even saving your money in the bank got its own risk but ofcourse investing your money into something will be far more riskier.
You might want to read a few post back about the idea of investing in either gold or other investment type, basically safe deposits could be an alternative between saving and investing though
What do you mean by safe deposit? Did you mean putting your money in the bank?
I guess it will only be safe if you choose the right bank so you are confident in saving but still the inflation rate will be the negative thing
especially if you are living in a country that is not economically progressive.