rpi-clone
                                
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                        noobie help on what I did wrong :-)
Attempting to clone my 64GB card to my 128GB card, then vice versa in a couple of weeks after any substantial changes. 128GB SD card is in a USB card reader.
Using Example #1 i ran sudo rpi-clone sdb which produced the image below and looks to be correct.

I select 'Y' and it runs to completion. However, once I swap the cards to test out the new clone copy, it doesn't boot. What have I done wrong? Thanks!

I have the same issue... also newby here
Same here. Just tried to clone from SD card to a USB 3 thumb drive. Everything worked fine with no errors, but USB drive will not boot (this Pi has been set to boot from USB and has successfully done so with a thumb drive created with Etcher). Please help.
I have the same issue. Additionally, I cannot boot from the original SD card now. Is there guidance on reverting any changes to the source during this process?