Posted Jun 12, 2012 23:19 UTC (Tue) by Baylink (subscriber, #755)
Parent article: Obnam 1.0 released
If it copies to another hard drive, it's not a backup.
It if copies to spinning optical media, it's only barely a backup.
As someone who's been a professional system administrator for over 2 decades (and can still read cartridge tape backups* made that long ago, please believe me when I say: if it's not on tape, it's not a backup.
If you don't have at least 2 (preferably 3) copies and one of them isn't outside the building (and preferably the metropolitan area; pity the people who kept their 1WTC backups in 2WTC, or even 7WTC), it's not a backup.
If you don't verify it after write, test-restore it, and check it about every 3 years, it's not a backup.
"Backup" is a word the semantics of which people depend on; just like with version numbers. There are really good reasons not to repurpose that word to mean less secure things, because even if you tell people, they won't get it, or remember it.
(* I have DC-600s from 1996 that I test-read last year, after a retention. No appreciable hits.)