[BackupPC-users] High Backup Data Volumes After Re-adding an Excluded Di

While trying to diagnose the high backuppc data volumes issue posted to the mailing list on June 14th, I had excluded a directory structure containing about 140MB of data. I removed the exclude once Craig had provided a fix for File::RsyncP and noticed that backup volumes jumped by about 150MB. Tracing suggested that all the files in the previously excluded directory structure were being backed up on every incremental backup, even though the content of the files was unchanged (the first incremental backup after the directory was added indicated that backuppc had found the file in the backup pool).

Although the contents of the files had not changed, I had 'touch'ed the files during the period where the directory structure has been excluded so that Google Sitemap would index them . It seems that the backuppc incremental backup got confused and repeatedly selected the files for backup even though the file date was no longer changing.

File::RsyncP/rsync should have determined that the contents of the files were identical to the pool copy. Verbose logging suggests that checksums were exchanged, but rsync did nothing with them (the remote system reported false_alarms=0 hash_hits=0 matches=0). The reason is not clear. I had enabled checksum caching at one point but disabling checksum caching it did not change the symptoms.

The problem was 'fixed' by doing a full backup. It appears that this caused rsync to properly compare checksums and backuppc updated the file date - the next incremental backup did not check the files that previously had been copied in full. I 'touch'ed one of the files and verified that the next incremental backup checked the file but rsync found no changed blocks.

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[BackupPC-users] High Backup Data Volumes After Re-adding an Excluded Directory