I am a new member and my graduation project is about "Symanetc backup exec and recovery 12.5" and I need a guide or tutorials to backup and recover the files i have.
You're in the wrong forum section, you are looking for the Backup Exec 2010 for Windows Servers portion of the forum. As for a guide explaining how to backup and restore files in v12.5, refer to the user manual included with the CD. If you don't have the CD, go to this link here:
