On Mon, Oct 10, 2005 at 10:56:08AM -0700, Dave Martini wrote:
> Does a level 9 everynight backup more data than an incremental everynight?
> 
> I do Level 1 through 4 on each consecutive Wednesday so the first Wednesday
> I do a level 1 and the next Wednesday I do a level 2 and the so on 
> with Level 9's
> each of the days in between.
> 
> My uderstanding is that a level 9 will backup all data since the 
> previous lower level
> exclkuding level 9. so my Saturday backup will backup all data since 
> Wednesday's level
> 1 for instance.
> 
> Does this mean that if a 1 gig file was changed on Thursday and then 
> written to
> tape on Friday and if that file wasn't changed again on Saturday that 
> on Sunday's
> backup it will still backup that file since it goes back to 
> Wednesday's level 1??

Yes.  If you run consecutive backups at the same level, the last backup
will contain all the data that changed (meaning if you have to do a
restore, only the last backup's tapes are needed.)
 
 
> If I did incrementals it wouldn't backup this file on Sunday and thus less
> data is written to that tapes?

Incrementals build off of each other, so yes, if the file hadn't
changed since Thursday, it would only be on Friday's backup.  But, if
you need to do a restore from Sunday, you could need all the incrementals
after the last level backup to do that restore.

Dave

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