Directory Compare is a utility to help you keep copies of your important directories (documents, programs under development, and so on) in a backup hard disk or any other storage system (like 100Mb diskettes), as well as in a compressed .zip file (only in version 2.53). The backup may be made automatically (in unattended mode) or by using a friendly user interface.
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I use Directory Compare for many years and it is still the most convenient and simple software to compare directories.