Tape Backup Recommendations

[Richard Smith]

I am looking for a tape backup solution for a large (100+ GB) database.
Preferably rack mounted using an external SCSI connection to the rack
mounted FreeBSD backup server. 

I am considering a DLT autoloader of some sort, and the FreeBSD release
notes do suggest that SCSI autoloaders should be supported. I have no
experience of autoloaders, do they look like continuous tape to the OS,
or do I need to do some magic to use them? 

Any recommendations or suggestions would be gratefully appreciated?

Thanks,
Richard.