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I guess the title says it all.

I would like to save the pictures to my external drive to use it on my other OS.

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It doesn't appear to cache any images. It saves the current background at /home/<username>/.config/ubuntu-tweak/lovewallpaper.jpg

I gathered this info using lsof - it only saves the files it downloads in a temporary directory while downloading, then deletes it and replaces the current one with the next one.

Gather the backgrounds you want and copy that picture for each one.

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I don't use this tool so I can't really say, but if I should make a guess I'd say have a look at /usr/share/backgrounds/.

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No they aren't there. – tk4muffin Jan 29 '13 at 20:29
Ubuntu tweak doesn't have root privileges. If it was going to store it into something like that, it would store them at /home/<user>/.local/share/backgrounds. /home/<user>/.local/share is the user's equivalent to /usr/local/share. – Kupiakos Jan 29 '13 at 21:14

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