Recording Ultra HD studio cameras individually

This is a church setting. We have 3 Blackmagic Ultra HD studio cameras that are connected via fiberoptic to a 12g sdi talk back. We then have it sent to ATEM1 M/E Production Studio 4k switcher. Our sound mix is sent from the sound board to one of these cameras and sent to the LIVE feed. I would like to record the feeds from these cameras individually for post LIVE production editing. These cameras do not have C-ports, nor SD card slots. Is there a way to record on each camera? Thank you for your help.

U need Hyperdecks .. or 8K Hyperdeck (allow 4x UHD record) ..