Backup Exec 2012 C:\ drive full and Backup are getting failed

Hi,

I have backup exec 2012, and all the backups are getting faild as the C:\ is full size.

Please let me know, what to delete in C:\ drive so that I can free up the disk size.

Find the attached picture, I was getting When I am trying to view the error log.

Thanks,

Shakeel