What is this in Documents?

In my Documents folder I have files from past months that read like this: iPhone_4.064bit_13.3_17C54_Restoreip….      Apple Device Soft.... 9/28/19 12:23 PM. 3.62 GB

Most of them seem to be from 2019 and 2020. The newest one I see is April 2020/

Can anyone tell me what these are and whether I can/should delete the files?

Thanks.