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If I may be allowed to digress from your actual request:
before I quit my Photoshop session I downsized the image and did a Save - As .jpg so I would have a draft copy.
For such occasions I use Scripts contained in a Configurator Panel that duplicate the images flattened-ly and do the rescaling, saving and closing on those, thus avoiding risk to the layered files.
If you want to give it a try let me know.
Thank you, c., for the suggestion and offer to help. I'm quite aware of making duplicate images, etc., to avoid what I boneheadedly did. I actually have an action that does the job, though I've kind of stopped using it now that Photoshop can now Save-As a Copy directly to an 8 bit JPEG from a 16 bit document. Perhaps I should resurrect it. I rarely make this kind of mistake, but it was late and I was tired. My practice of changing folders for my final sprint to the finish line saved me in this case, as I had only done one or two small things that needed redoing.
But it would have been nice to find the previous version of the file all nestled and waiting for me in the Recycle Bin.
I would want that feature too.
A few times I had experiece of Photoshop freezing the PC when saving a particularly large file. It would delete the original and freeze up while writing a new temporary copy. And there was no way to restore those deleted 1-2 Gb files with hours of work. The freezing on saving doesn't bother me now. Maybe it was a Photoshop or Windows bug that has been fixed eventually. However, it would be much safer if the files were deleted into the recycle bin or if Photoshop was making sure that the new copy is fully saved on the HDD and the file is closed, then delete the old copy and rename the new one.