Hi, On 2009-07-20 08:07, Dean Cording wrote: > My understanding of rdiff-backup is that effectively nothing is ever deleted > and therefore the backup size should always be increasing. For example, if I > create a 1Mb file, back it up and then modify 500Kb worth of the file, then > the next backup will grow by 500Kb consisting of the file in its current > state and the 500Kb diff of original data that was modified. Even if I delete > the file, the last version is still kept on the backup. > > If that is the case, how do you explain the following session statistics > where the TotalDestinationSizeChange is negative. > > --------------[ Session statistics ]-------------- > StartTime 1248023705.00 (Sun Jul 19 13:15:05 2009) > EndTime 1248024106.28 (Sun Jul 19 13:21:46 2009) > ElapsedTime 401.28 (6 minutes 41.28 seconds) > SourceFiles 45598 > SourceFileSize 309310435 (295 MB) > MirrorFiles 45598 > MirrorFileSize 311633827 (297 MB) > NewFiles 0 > NewFileSize 0 (0 bytes) > DeletedFiles 0 > DeletedFileSize 0 (0 bytes) > ChangedFiles 114 > ChangedSourceSize 68692958 (65.5 MB) > ChangedMirrorSize 71016350 (67.7 MB) > IncrementFiles 115 > IncrementFileSize 473538 (462 KB) > TotalDestinationSizeChange -1849854 (-1.76 MB) > Errors 0 > --------------------------------------------------
Just a guess: maybe because the diffs are gzip compressed? If you make a change, and the reverse diff to the last state of the changed file is compressible, it could result in the reduction of the total size. Patrick. -- Key ID: 0x86E346D4 http://patrick-nagel.net/key.asc Fingerprint: 7745 E1BE FA8B FBAD 76AB 2BFC C981 E686 86E3 46D4 _______________________________________________ rdiff-backup-users mailing list at rdiff-backup-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/rdiff-backup-users Wiki URL: http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki
