Les Mikesell wrote:
> Rob Owens wrote:
>> Holger Parplies wrote:
>>> - The higher the level of the incremental backup, the greater the
>>> speedup,
>>> but the less certain you are of not having missed some changes.
>> In the case of rsync, is a greater speedup achieved due to 1) less
>> calculations to make about what to transfer, or 2) less actual transfer
>> of files?
>
> In backuppc's case the big differences are that an incremental run
> skips files where the timestamp and length match in the directories
> where a full compares block checksums over all files, and a full run
> also rebuilds the pc directory completely.
>
>> I'm still a little fuzzy about how rsync interacts with the pool, and
>> I'm trying to minimize my file transfers on hosts that I back up over
>> the internet. For instance, suppose my full backup consists only of
>> fileA.txt and my first incremental backup consists of fileA.txt and
>> fileB.txt. If no more files are added on the host, does my next level 1
>> backup (using rsync) re-transfer fileB.txt because rsync is referencing
>> the last full backup, even though fileB.txt already exists in the pool?
>
> The 3.0 version has an option to control that.
What option is that? I think I need to spend some time getting to know
that option... Are you referring to the $Conf{IncrLevels} option? I
was looking into that, but again I'm up against my lack of understanding
of how rsync interacts with the pool when determining which files to
transfer.
-Rob
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