Location of Donation Form Data

We need to collect a fairly extensive amount of data from our donors.  Design of the form was straight forward.  What is unclear is how this data is stored/ accessed.   The donor 'profiles' are devoid of the form data.   The documentation is unclear.  I see that standard forms can be attached to an external file.  Is this the same with the donation forms?  Thank you in advance.

Where is the donation form data stored?

I would like to know the answer to this as well! The comment field is especially useful donor data.