If your online life is divided at different locations; like office and home, you may be wanting to synchronize different files and folders, which are located at your office computer, your home PC, your laptop and your USB drives.

There are many options. Simple copy and paste. But that is too crude.

A few freeware like Allway Sync etc. They are nice but, somehow, I am always skeptical of using third party software.

Now Microsoft has released latest version of SyncToy 2.0 beta for letting you synchronize your files. It is free and comes from a trustworthy source like Microsoft. And so, I like it. With this, you can easily copy, move, rename, and delete files between folders and computers so as to achieve perfect synchronization.
Independent Thoughts:
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