When making back up dvds, which do I choose?

Aa I make back-up CDs or DVDs of my favorite images, does it matter if I make them large JPEGs, Tiffs or...?  Not sure I understand the advantages or disadvantages of the options.  thanks.

I'd make backups of whatever files you have on your hard drive, without doing any sort of export. The originals you shot and then imported into Ligthroom, whether RAW, DNG or JPEG, are going to be the highest possible quality.
In general terms, though, TIFFs are higher quality (they have lossless compressions, meaning that they are the exact same - pixel for pixel - as the original. As a result, though, they tend to have a much larger file size. JPEGs are compressed (the program saving to JPEG might degrade the quality just a bit - or a lot - to make the file size significantly smaller).
So, if you want to keep the highest-possible quality and don't care much about file size, go with TIFF. If you need to keep file size down and don't mind sacrificing just a bit of quality, go with JPEG.
Hope that helps - if you have any other follow-up questions let us know.

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