If you need to export your entire Media Library for safekeeping or even just for a review in your Image browser, you can use this simple method.
Install a plugin
Go to your Plugins menu on your sidebar and click on “Add New”
In the Search window, search for the keyword “export media”. Find the plugin Export Media Library (see screenshot). Install it and activate it.
Go to the Media Menu on the sidebar and you’ll now see an Export Option. Click on it and then click on Download Zip
This will download your entire media library into a zip file that you can store for archiving purposes or unzip and view all the pictures you have in your library. It may be useful if you want to do a bit of cleanup of older media.
That is all. If this was useful, please share. It might be useful to others.