Brains are the thing to focus on in regard to how data is stored in regard to chemistry, which is a fundamental aspect of biological [life] forms.
Living structures able to store memory.
The memory of course is data. It is secondary to the point that memory can be stored, whatever the device. It is not so much what stores it as to what creates it and retrieves it.
Biology breaks down. As a storage device it has its limitations and if the pathways are damaged other pathways have to be built but eventually the gig is up and no retrieving can be done.
Now in terms of an individuate consciousness which experiences life from the perspective of being within human form, what it experiences creates the data which is stored in the brain it has the use of, and it [the individuate consciousness]alone is the only thing which can retrieve said data for itself/use.
The importance of this fact is worth the effort repeating.
In a physical universe it most obviously appears that devices are necessary for data storage, but this observation alone does not compel one conclude that other devices are not attached to that data or to the processes of individuate consciousness (your processes as an individual) that the data of your/my/our experience(s) is/are not able to be stored elsewhere or retrieved as is necessary.
The concept of 'the soul' has this attached to it.
If you trace back to the origin of the idea of the soul you will discover a time when being aware of the connection with that larger aspect of your total self was common place. It is now largely unknown but that does not signify it is a dead thing.
Furthermore the idea of the soul is not that you have one, but that the one has you.
You are its data gatherer.
Now call it what one will, it is able to be connected with and communicated with and through a variety of engaging processes, understood for what it is by its own explanation (as to what it is) independent of what you might otherwise think, have thought, or even that you resist thinking, or have never thought along such lines in relation to the idea of this thing sometimes called 'soul'.
All that is required is in order for it to communicate to you what it is, is your attentive focus and ability to at least meet it halfway in relation to the physical and how data is transferred.
I have heard such arguments before. There are many who want to believe that the soul, or consciousness, is not the brain. One way to make such a hypothesis fit with our modern understanding of the brain is to consider it the conduit, or as you say the "data gatherer" for the "soul".
Others here have already tried to dissuade you from this notion, and I will throw my 2 cents in as well.
Our experience consists of (off the top of my head):
1) sensations of the world around us,
2) memories of our past experiences,
3) feelings or emotions
4) thoughts, usually involving our primary language
5) imagination of possible events similar to those we have had
Please, anyone feel free to enumerate other components of our conscious experience which I have not included. I'd like to develop a comprehensive list.
All of these components can be shown to be directly dependent upon the activity of the brain. You already understand this regarding our sensory apparatus. Any damage to our sensory pathways removes that very specific sensation from our awareness. Blindness, deafness, and anosmia are quite common. In addition higher levels of perception may be disturbed by stokes in the neocortex and thalamus. A stroke victim may very specifically not recognizes "faces", or, may not recognize his/her own arm or leg, or may no longer attend to anything to their left or right. As you have said, this is all possibly consistent with the "brain as data gatherer for the independently existing soul" hypothesis. The results of brain stimulation, however, is more difficult to reconcile. When sensory areas of the brain are stimulated by microelectrodes in awake human patients, the conscious person has sensory experiences. In other words, artificially setting off a circuit of neurons firing in a network gives rise to sensory experience!
The same can be said for all the other components of conscious experience I have listed, memories can be eliminated be damage, or triggered by stimulation. Feelings can be triggered, including fear, anger, deja vu, and out of body experiences, by direct brain stimulation. People experience dreamy states and hallucinations based on brain damage, epileptic seizures, drugs, or direct brain stimulation.
My conclusion is that all of the components which make up "me", all my thoughts (language), memories, and feelings are all brain activity. There isn't any part of "me" which is not my brain. If my brain is a data gatherer, then what is gathering the data? It apparently has no thoughts, memorys, feelings, or sensations of its own, those are all in my brain. Whats left to be independently existing?