How do I ZIP compress existing TIFF tiles in Lightroom 3?

I have imported about 1000 .tif files into Lightroom and done some cropping and basic editing to them. They are 8bit uncompressed tiff files in Adobe1998 color space. I am trying to find a way to compress the original tiff files with ZIP compression in Lightroom. I don't want to export them because I want to save the original files and their edit history. I don't want to loose the original files before I cropped or color corrected them. I just want to reduce file sizes. Does anyone know how to do this?
Thanks so much for your help!

You can´t compress original files into zipped files within Lightroom.  If you are not actively using these images in LR, you may wish to zip them all up outside LR and then delete the originals. LR will then show them as missing, but will keep the metadata, including editing history, in the catalog.  You could write the metadata to xmp files before you zip up your originals, and include these xmp files with the originals in the zipped folder, if you want to play it really safe.  It is not necessary to keep the originals around as such.  LR keeps track of what they were and what had been done to them internally, even if they are missing.  When you need to work with these files again in LR, you can unzip them and show LR where they are.

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