Adam Goryachev wrote at about 00:34:44 +1000 on Thursday, July 2, 2009:
> error403 wrote:
> > However, using this method, I also found out that backuppc was
> > copying EVERY files from the host, even on incremental backups,
> > because (I assume) it needed to compare locally the files before
> > updating the ones in the last backup.
> >
> > So, my 2 questions are, is there a way to script a way to compare the
> > files before the copy, to make a way to skip files that are not
> > needed in the tar method,
>
> I would have thought the default config for a tar backup would be to use
> the date/time of a file to decide whether or not to include it in the
> backup... but I don't use this, perhaps you should check what flags you
> are giving to tar for full/incremental...
Also try using "ls -al" with the sshfs mounted to make sure the
date/time is correct for the files.
> > and is there a way to tell backuppc to NOT
> > start if the mounted directory is empty to prevent empty backups?
>
> - From the config.pl file:
> # A backup of a share that has zero files is considered fatal. This is
> # used to catch miscellaneous Xfer errors that result in no files being
> # backed up. If you have shares that might be empty (and therefore an
> # empty backup is valid) you should set this flag to 0.
> #
> $Conf{BackupZeroFilesIsFatal} = 1;
>
> This will mark the backup as failed, and so will retry as per your
> configuration until it is successful.
However won't this retry every hour which will cause a fair bit of
overhead as it goes through the entire backup process only to see it
is empty. I assume what the OP wants is to mark this as a correct but
empty backup (leaving no trace)and to not try again until the next
regular backup time period
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