LogMeIn Backup features block level incremental backups, meaning
that the Backup file is effectively segmentized.
When a change is
made to a file, Backup is able to detect which segment of the file has been
changed. It could be that only one small part of the file has been changed, if
so, on subsequent Backup operations, only this part of the Backup Set is
transferred. If the whole file has been altered, then the whole file gets
transferred. The obvious benefit here is that only changed parts of files need
to be backed up, thus reducing backup times and traffic.