Time Machine and Console log

MacBook Pro Mac OS 10.6.8

Hello all

Below is an excerpt of the Console log I got this morning after a TimeMachine backup to my external HD.
In this log there is a very odd thing (in red): Copied 2618 files (935 bytes) from volume Disque dur..
That means that each file has, on average, 0.36 byte per file. How is that possible?
Is there somebody who could explain what kind of files they are?

15/08/12 10:35:39 com.apple.backupd[3034] Starting standard backup
15/08/12 10:35:39 com.apple.backupd[3034] Backing up to: /Volumes/LaCie/Backups.backupdb
15/08/12 10:35:51 com.apple.backupd[3034] No pre-backup thinning needed: 2.75 GB requested (including padding), 65.44 GB available
15/08/12 10:36:32 com.apple.backupd[3034] Copied 4113 files (231.1 MB) from volume Disque dur.
15/08/12 10:36:34 com.apple.backupd[3034] No pre-backup thinning needed: 2.48 GB requested (including padding), 65.19 GB available
15/08/12 10:36:47 com.apple.backupd[3034] Copied 2618 files (935 bytes) from volume Disque dur.
15/08/12 10:36:52 com.apple.backupd[3034] Starting post-backup thinning
15/08/12 10:36:52 com.apple.backupd[3034] No post-back up thinning needed: no expired backups exist
15/08/12 10:36:53 com.apple.backupd[3034] Backup completed successfully.
15/08/12 10:37:04 com.apple.backupd[3034] Stopping backupd to allow ejection of backup destination disk!

Thanks in advance for any help!