'Listen' for new database entries from a plugin

Hi

I was wondering , if it is possible to write a plugin, that 'knows' if
for example a new user registers.

E.g would it be possible to write a plugin, that automatically
duplicates/backs up user registration data, without requiring any
modifications to the User model.
(I know i could easily make it using User model alone, but im trying
to learn how to make plugins.)

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