WinMerge 2.8.6 is a free file merge software.
I tried some file synchronization tools, but none of them safe enough to protect my file from overwritten/deleted accidentally. I would rather choose to use WinMerge to do the file synchronization manually.
After you select 2 folder, one in the harddisk, one in the backup USB memory stick, the software will highlight the difference in the files, timestamp, and also the file content. You can choose to copy files to synchronize the 2 sides or delete the unnecessary (e.g. temp files) file easily.
For different files, WinMerge can show the detail difference between the 2 files. It is in particular useful if you are working on large amount of text file, or source code.
URL: http://www.winmerge.org/downloads/index.php
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