Time Machine Backup Problems

I recently updated my MacBook Pro (2017 model) from the current older iOS Sierra to the latest iOS Ventura 13.5.1. I have never had any issues doing my regular backups with my Seagate backup drive for Mac but now suddenly after this upgrade my MacBook will no longer recognize this same backup drive nor let me do backups. Would this be do to my updating from Sierra to Ventura or would this be an internal problem? I've tried a few different backup drives with new connections and all say the same thing - no backup drive connected. Please help/advise what I need to do; I want to protect my files, photos etc on this MacBook.