Zilla is a free photo/video backup assistant that helps you to keep your memories backed up to your Flickr account.
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If you are falling short of bandwidth or for any other reason you need to pause photo uploads from a folder to your Flickr account, simply click the 'pause' icon. You can pause the Uploadr for as long as you need. Zilla will not upload new photos from this folder until you resume automatic upload. Refer the screenshot below.