but come to think of it, those little amount of money that you want to be keeping as savings why not use it and invest in BTC continuously becaus that money you want to keep as savings can also be called your (discretionary income) rather than keeping it in a bank as savings which will not bring you profit in return, why not use the money and be buying BTC and hold it for long period of time, no money is too small to be invest.
It is wise to start investing after doing a thorough study about Bitcoin. If you do not get the right information about Bitcoin, you will not be able to invest for a long time. You will be scared by the downward trend of Bitcoin. However, if you start investing in Bitcoin from the downward market, you will be able to profit a lot after a certain period of time.
However, remember, Bitcoin is not a scheme to become rich by investing in the short term.
I'm sure if you wanted to invest a small amount you wouldn't be thinking of cashing it out after it grows like 2% within a month. for small amount to gain a considerable amount of profit, you would need the price of BTC to climb more than 400k or more so when you have small amount just forget it on your wallet. Withdraw them if you really needed such as small amount.
But why invest small when you can do bigger by DCAing as most people would suggest.