Thank for your answers regarding the space issue, as well as the
differences between l0's and l1's. What exactly do you mean when you
say "average change rate"? Right now BPC is set at the defaults -- to
keep 1 full with an age of 90 days.
--
-a
"Ideally, a code library must be immediately usable by naive
developers, easily customized by more sophisticated developers, and
readily extensible by experts." -- L. Stein
On Apr 20, 2009, at 10:42 AM, Les Mikesell wrote:
> 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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