Just create multiple jobs, each one backing up a different set of databases.
The limiting factor would be your disk and CPU subsystems - are your database files all on the same or different set of disks, are you writing the backup files to the same or different set of disks, do you have enough CPU capacity to service the various backup threads etc.
SQL Backup Consultant Developer
Associate, Yohz Software
- SQL Backup goodies under the hood, updated for version 7