Udev – action add – remove

How to modify linux attitude when plugging and unplugging some devices to run some scripts?
For example, it could be nice if plugging a particular usb drive starts a backup script. Let’s see.
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udev – UUID (en)

Is there a way to identify univocally a partition? udev can refer to a partition (doesn’t matter the device name) using the UUID. What’s UUID, how to discover it and how to use it?
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