About the default media set

When Backup Exec is installed, the following important defaults are set to protect media from being overwritten:

A media set named Keep Data Infinitely - Do Not Allow Overwrite is created.
The append and overwrite protection periods are set to Infinite for the media set Keep Data Infinitely - Do Not Allow Overwrite.
All backup jobs you create are associated with the media set Keep Data Infinitely - Do Not Allow Overwrite.

By using these defaults, you can keep all of your backup data safe from overwriting (unless you erase, label, or format the media, or associate it with scratch media). You will eventually run out of overwritable media unless you continually introduce scratch media into Backup Exec.

To ensure that Backup Exec has media available, you can do the following:

Create new media sets with append and overwrite protection periods set to intervals of time that accommodate your needs (such as weekly, monthly, etc.) and then specify these media sets when you create a backup job. When the overwrite protection period expires, the media are still displayed as being associated with that media set, but with a status of recyclable. Whenever more media are needed for other jobs, Backup Exec automatically finds and overwrites recyclable media.
Change the append and overwrite protection periods of the media set Keep Data Infinitely - Do Not Allow Overwrite to finite periods. The risk with changing the overwrite protection period in the media set Keep Data Infinitely - Do Not Allow Overwrite is that if you continue to use this media set as the default media set for all backup jobs, your data may not be protected as long as you need it to be.