These plugins, by their description, appear to do what you want.
-
Cache Images (by Matt Mullenweg—if I were you, I’d try this first)
But looking at the support forums, it’s apparent that the plugins work for some and don’t for others (probably due to some incompatibilities).
So, you’d be better off if you…
-
backup your WHOLE site — database, images — everything, before trying the plugin(s).
-
Make sure the
uploads
directory has proper permissions (755)`
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