Jpeg degradation when not editing

Some years ago, I was given to understand that jpeg images lose quality when edited, and I have seen this for myself when cropping. At the same time, I understood that I could save an unedited jpeg repeatedly, with no loss of quality, as long as I did not edit it at all.
I keep two external storage devices as backups for my libraries on the computer, and I need to reback these up when I add a new event to a library. Hitherto, I believed that I was not suffering image quality loss when doing repeated backups which involve no editing at all.
Recently, I have noticed several references in discussions to the loss when saving jpeg images, and am confused again.
Does anyone have a definitive answer to the question "When I back up my libraries on a regular basis, without any editing, do they stay the same quality, or do they deteriorate a little?"
I should be extremely grateful to know the answer. If it makes a difference, I use iPhoto 09 8.1.2 (424)

Dear Terence
Thank you for your answer. I suddenly had a hideous vision of all my images having the digital equivalent of moths!
Many thanks
Chris

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Jpeg degradation when not editing

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