Opening a bank account is an important part of investing. It can help to keep track of where your money is coming and going. Some have a hard time because their expenses are greater than their income. A simple budget can help plan where their paycheck can go. And if done right, there should be some left over to save. Putting this into a savings account is a good way to keep part of your paycheck. An important note is that the activity in this account is deposits only, no withdraws. This is to make sure that the money is secure and will not be used for any purpose other than for retirement. This is also separate from the portfolio, it should not be counted with stock funds since one is an investment and the other is savings.
Saving as much as you can for ones retirement can be difficult at times especially with different needs that come up periodically. Address these things as they come by having plan so that the savings account does not have to be tapped. The money that is saved should not be used. It is to remain secure.