DVR features and billing

I have a question that that should be very simple to answer, but despite repeated discussions over the phone and searches in the Xfinity website and on the web, have not been able to get this resolved. Because my “TV boxes will no longer allow you to access Xfinity On Demand” I recently received an X1 system that included a PX013ANM and two XiD-C boxes. And, despite being assured that there would be no additional cost, had a cost increase. My billing included the three boxes (no change from before the X1) plus an additional “Premium DVR Service” monthly fee. There was no such additional fee in my prior billing.

I have been unable to determine what this premium DVR fee is for and have been unable to determine what DVR storage capabilities I have (with and without the premium dvr service). Previously I was able to store about 200 to 300 hours of video on the old Comcast cable box DCX3400/A385/000/320, and over the years accumulated various movies and programs that I could not find elsewhere. My questions are:

1. Does the X1 box use on-board storage and/or cloud storage.

2. How many hours of video can I store on-board and how many hours in the cloud?

3. Do I have any control where recordings are stored?

4. Is there any limit to how long recordings can be stored? I’ve seen some mention of a 1 year limit, but it is not clear.

5. Do I need the Premium DVR service? What is it providing? More recording hours? Longer retention times? Other features?

6. Since there was not supposed to be any increase in cost, can you help me have this fee removed?

7. Is there any way of downloading the recordings from the DCX3400? Can they be downloaded through the USB port?

This “upgrade” that I did not even want, has caused hours of frustration. Any help in providing the information and getting this resolved would be greatly appreciated.