What hardware are you replacing? If you are on the older optik tv then I believe your recordings will be gone as they record to the boxes hard drive. If you have the new optik tv system with the android tv box then I believe all recordings are in the cloud so you would be able to access them on a new box.
I heard some Reddit users with Bell claiming they can swap disks and keep the recordings without Bell’s bother. Bell & Telus have exact the same legacy dvr.