SQL Server 2005 Express Edition is the next version of MSDE and is a free, easy-to-use, lightweight, and embeddable version of SQL Server 2005. Backup Exec uses the sql express edition for its database to get stored.
If you want to backup a remote sql server then you have to have a sql license to backup the sql server. But if you just want to backup the backup exec database then you can do following steps:
1> stop all the Be services and sqlserver(bkupexec)
2> Take a copy of data and catalog folder
3> In case of disaster you can always restore these folders to get your jobs back
4> Once done start the Be services and sql service