Date: Fri, 29 Sep 2000 08:05:05 +0200 (CEST) From: Micke Josefsson <mj@isy.liu.se> To: j mckitrick <jcm@FreeBSD-uk.eu.org> Cc: freebsd-questions@FreeBSD.ORG Subject: RE: dump levels/incremental backups Message-ID: <XFMail.000929080505.mj@isy.liu.se> In-Reply-To: <20000929033448.A59083@dogma.freebsd-uk.eu.org>
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On 29-Sep-00 j mckitrick wrote: > I think I found enough scripts to help me choose a backup solution. But I > have a couple of questions. > > Is there some secret to what the 'levels' are in dump? Not that I know of. Level 0 dumps the lot, level 1 everything changed since Level 0, level 2 everything changed since level1 etc. > What is the purpose of the 'Towers of Hanoi' number pattern? It is a way of reducing the number of tapes needed to restore to get everything back in business. I make a level 0 every week, and then only consecutive level 1 backups every night. This way I only have to use two tapes to get the system restored: The level 0 and the last of the level 1's. This is since I can fit a weeks worth of level 1's on one of my tapes. I use /dev/nrsa0 to get them all on the same tape. If your site is busy then using level 2...9 might be neccessary to make it fit in one tape. > Is the tar incremental backup simply based on comparing the modification > times of the existing files to the stored ones? Dunno this, I only use dump. > Thanks, > > jcm > -- > "I drank WHAT ?!" - Socrates > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message ---------------------------------- Michael Josefsson, MSEE mj@isy.liu.se This message was sent by XFMail running on FreeBSD 3.5-STABLE ---------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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