Saving incoming data while using startBackground

Dear All,

I am using an NI DAQ device to get some analog signals. Simply, I need MATLAB to read and save the data in the back ground. I found that startBackground function is very helpful. However, I can only "see" the real-time acquisition of the data, without being able to store them.

I need to use startBackground function because I need to collect and store the data while other parts of the code are implemented.

Thank you,