Backup on Advant OS500/B2600
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Yes, the last "feature addon" (a purchasable option) made it possible to perform a Station Backup to a file instead of tape.
It's no magic, just an alternative always possible in the low level "fbackup" command that does the job.
Then there' HP's "Ignite" (on the product media, at least the CDROM) which can backup to tape, file or network depot (another station running HP-UX). Ignite backups are bootable(!).