Hello,
1. Have you enabled incremental backups? Ensure that this option is checked so that only the file changes will be backed up.
2. What are the number of file revisions that you have set? Do you want one or many revisions? Check in Profile, (Select profile), properties, Backup selections (select apropriate), Modify, Revision Control, and specify the number of file revision that DLO must to retain, when file are modified.
Revert if the issue persists.
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Regards.