Need a App to Compare Two Data Sets

I have two sets of data here - on two separate hdd's - one is master the other is backup. they
are non-critical data but need to be backup up the same. Its been 2months since the " backup" was backed-up.
Is there any app or program that I can use to compare the two data sets - so there is no overlap?
jetsonxAsked:
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SysExpertCommented:
Winmerge and similar should be able to comapre them.

not sure what you mean by Overlap.


I hope this helps !

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jetsonxAuthor Commented:
thanks for the suggestion but cannot you recommend any others?
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SysExpertCommented:
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Computer101Commented:
Forced accept.

Computer101
EE Admin
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