Doing both thing would be the best thing to do but just remember how to handle your time on doing those things because you would really have a hard time when you pursue that you can't really achieve. Saving without purpose as you said is somewhat useful but the possibility to save on that mindset would be possibly changed or your not serious of saving because you don't have plan for your saving but if you have set goals to your savings it would be much more better because you would really save because you set a particular plan.

I think that saving would be good on bitcoin only not on the actual money.  As we all know that the price of bitcoin itself may goes up.  And I would want to save some bitcoins as it is like investment that actually grows without putting it in any investment sites.   Unlike if you will save the money which only have this percent interest and about a year you would find that inflation is higher than the interest rate of your savings.  But of course it is better to save than have nothing at all.

i am prefered investment
i want my money is always growth so is can pasive income for me,saving in my bank only result my job online and offline

Doing both thing would be the best thing to do but just remember how to handle your time on doing those things because you would really have a hard time when you pursue that you can't really achieve. Saving without purpose as you said is somewhat useful but the possibility to save on that mindset would be possibly changed or your not serious of saving because you don't have plan for your saving but if you have set goals to your savings it would be much more better because you would really save because you set a particular plan.