Let’s examine an example session statistics file:
StartTime 1028200920.44 (Thu Aug 1 04:22:00 2002)
EndTime 1028203082.77 (Thu Aug 1 04:58:02 2002)
ElapsedTime 2162.33 (36 minutes 2.33 seconds)
SourceFileSize 8535991560 (7.95 GB)
MirrorFileSize 8521756994 (7.94 GB)
NewFileSize 23601632 (22.5 MB)
DeletedFileSize 10346238 (9.87 MB)
ChangedSourceSize 86207321 (82.2 MB)
ChangedMirrorSize 85228149 (81.3 MB)
IncrementFileSize 13799799 (13.2 MB)
TotalDestinationSizeChange 28034365 (26.7 MB)
StartTime and EndTime are measured in seconds since the epoch.
ElapsedTime is just EndTime - StartTime, the length of the rdiff-backup session.
SourceFiles are the number of files found in the source directory, and SourceFileSize is the total size of those files.
MirrorFiles are the number of files found in the mirror directory (not including the rdiff-backup-data directory) and MirrorFileSize is the total size of those files.
All sizes are in bytes.
If the source directory hasn’t changed since the last backup, MirrorFiles == SourceFiles and SourceFileSize == MirrorFileSize.
NewFiles and NewFileSize are the total number and size of the files found in the source directory but not in the mirror directory.
They are new as of the last backup.
DeletedFiles and DeletedFileSize are the total number and size of the files found in the mirror directory but not the source directory.
They have been deleted since the last backup.
ChangedFiles are the number of files that exist both on the mirror and on the source directories and have changed since the previous backup.
ChangedSourceSize is their total size on the source directory, and ChangedMirrorSize is their total size on the mirror directory.
IncrementFiles is the number of increment files written to the rdiff-backup-data directory, and IncrementFileSize is their total size.
Generally one increment file will be written for every new, deleted, and changed file.
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.