Skip download if files exist in wget?

Question

This is simplest example running wget:

wget http://www.example.com/images/misc/pic.png

but how to make wget skip download if pic.png

Answer 1

The answer I was looking for is at https://unix.stackexchange.com/a/9557/114862.

Using the -c flag when the local file is of greater or equal size to the server version will avoid re-downloading.