I'm shooting weddings with EOS RP camera bodies and would like to use a backup solution in case any of my SD cards fail. The Canon Connect app is hard to use. Is there anything else?
Transfer from SD to an iPhone/iPad is possible with a simple $30-40 adapter.
Another option is to shoot to smaller cards (8 GB aren’t expensive, for example) and change frequently. Very unlikely for a card to fail when not in use.
The image tank concept is great for this, but it looks like no one is producing those anymore. So I’d go with the ‘lots of relatively small cards’ option.
All other options involve taking the time to copy over the images from the card to something else, which either takes up
your time or requires adding an assistant.