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Let's say there's an url, let's call it

This location has directory listing enabled, therefore I can do this:

wget -r -np

To download all its contents with all the files and subfolders and their files.

Now, what should I do if I want to repeat this process again, a month later, and I don't want to download everything again, only add new/changed files?

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up vote 31 down vote accepted

did you read this ?

"Several days later, you would like Wget to check if the remote file has changed, and download it if it has."

wget -N

Try this.

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wget -c 

also continues partial files caused when the download has issues.....
Better yet,

 wget -c -N 

seems to do both at the same time.

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