I googled around and couldn't find a product like this. Any idea if it exists?

What I basically want is a thumb drive that when I write a file to it, it has two chips inside of it. When you write a file to it, it writes it to two separate memory chips inside, so if one fails, it can start flashing red and you have time to backup your files from the other one.

Even better would be a time delay using a program like Rsync...so if there's a change to a file on the primary chip, it knows and automatically updates the file on a set interval of say 15 minutes.

I live in perpetual fear of thumb drive failure as I store work projects on it that often take weeks or months. I make backups, but still am not very comfortable.