I'm in need of some help understanding the session statistics. In particular, I need to know how much extra disk space each backup session takes.
According to the FAQ "TotalDestinationSizeChange is the number of bytes the destination directory as a whole (mirror portion and rdiff-backup-data directory) has grown during the given rdiff-backup session. This is usually close to IncrementFileSize + NewFileSize - DeletedFileSize + ChangedSourceSize - ChangedMirrorSize, but it also includes the space taken up by the hardlink_data file to record hard links." 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 -------------------------------------------------- Also, is there a way of roughly calculating how much data was transmitted between the client and server from the session statistics? Thanks, Dean _______________________________________________ rdiff-backup-users mailing list at [email protected] http://lists.nongnu.org/mailman/listinfo/rdiff-backup-users Wiki URL: http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki
