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I want to automatically synchronize some specific folders on an external USB HDD and an internal HDD whenever I connect the external drive to my PC.

How can I do this? Are there any free solutions?

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If you are using Windows then SyncToy from Microsoft is freely available.

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Ok, this isn't automatic, but I'll post here because it is a great solution and might be helpful for others who come to this post.

I put Toucan Portable on the external drive. Set up the sync or backup exactly the way I want it. Then run it whenever necessary when the drive is attached.

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