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The dis-advantage of differential compared to incremental is that it requires more storage space as many changes or differences are duplicated in each differential backup run in a cumulative fashion. Typically a differential backup is scheduled so that one full backup is performed weekly for example on Monday every week and a daily differential backup is run on the other 4 working days.
!differential-backup-diskio.png|width=331,height=217! !differential-backup-diskio.png|width=376,height=217!
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