Re: [BackupPC-users] A scheduling question

Schley Andrew Kutz wrote:
> Please pardon my ignorance. I have always been dense when it comes to  
> backups, and I am hoping that someone can simply tell me the  
> appropriate schedule for what I want to do. I basically want to mimic  
> Apple's Time Machine settings. I want an initial full backup and then  
> simply a backup of changed files every X amount of time (their  
> interval is hourly, mine would be daily). I don't want old backups  
> deleted until the drive begins to run out of space. Time Machine keeps  
> hourly backups for 24 hours and then rolls them into a 24 hour backup.  
> It keeps 7 24 hour back-ups (a weeks worth), and then rolls them into  
> weekly backups. Is this possible with BackupPC?

Backuppc won't adapt to the available space automatically other than not 
starting runs if you have less that 5% of the disk free.  However, since 
it only needs additional space for new/changed files, once you have an 
idea of the average change rate you can set the number of full backups 
to keep accordingly.

> Right now it has the default settings. Also, as I understand things, a  
> BackupPC full backup is only the files that have changed since the  
> last full backup. My question is then why do incremental backups, why  
> not just always do full backups. Is it because of the method to  
> determine if a file has changed? Timestamp vs. block checksum in Rsync  
> for example?

Yes, with rsync there is the difference in time for the checksum 
comparison for fulls - and on the server side, fulls also rebuild the 
directory link trees to be used for the next run.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com


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