Tt is very risky to save bitcoin if one day the price goes down, but you can still get profit if the price goes up.
Keep paper money at home, there is a risk of theft and if you save it in a bank, you can deposit and get some benefits.
But if we compare, maybe it will be more risky to save bitcoin
TBH, I have a very different understanding of them (investment and saving).
Investing in Bitcoin requires sufficient knowledge because it is a high risk. While keeping money in the bank, you don't need any knowledge because I see no risk at all. You only need to understand about how long you will save your money and how much you will pay to the bank monthly. It is very different when you invest in Bitcoin. If you invest in the wrong way, you probably get a loss because its value is volatile and unpredictable. While money (fiats) is quite stable, its value won't change drastically as Bitcoin value.