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My incremental or differential backup doesn't work. The program seems to copy every file. Why?
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Cobian Backup uses the archive bit of the attributes to check if the file has been changed or not. Sometimes the program fails to change the attribute and the file will be copied again next time even if it is not necessary. The archive attribute operation can fail for example if your source is on a Unix FS or other file system that have different attribute formats or if the engine doesn't have permission to change the attribute.

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