Mobileme backup?

does mobileme backup work in similar way time machine, in copies new or modified files, or copy entire directory each time?

have documents folder of 8.5gb , want set weekly backup if copies whole folder each time firstly take days backup , won't able store many backups 20gb limit.

 

as per knowledge mobileme everytime backup full directory instead of selected files recommended works per time machine opted ones backup updates untill time include that.so need take care of limits replace old 1 new every time.

 

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