"The last backup did not complete successfully."

I get the message "the last backup did not complete successfully" accompanied by an error code of 0x81000031.

The first time this happened I thought it was simply because I didn't do a clean install. I do the clean install and the backups happen every day at 4 in the morning like clockwork. I get about 7 consecutive backups to go and now suddenly this message pops up everytime I attempt to do another backup.

Is there any way at all that I can possibly completely delete the backup on my drive and have Windows just start over from scratch or does anyone know how I could just get the backups to continue again as they normally did?

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