You can do a dbbackup devc=file_class, which will put the dbbackup into a
file on disk.  The only thing is you'd then have to script a process that
somehow backs up that file, or do it manually.  Possibilities include:

FTP to remote site
tar to 4mm tape
tar to LTO

Personally, I'd rather not run so tight on scratches that I don't have 7
tapes I can spare for dbbackups.

Alex