I usually back up my photos on my ipad as well as rotating memory cards. I also upload my favorite photos each day to an online service, and e-mail them to myself - so I at least have those even if I loose everything else. Lately, though I have been wanting a more solid back up option. I don't often travel with a computer.
Here is what I am imagining - something like an external hard drive, but that doesn't require a computer. You simply insert your memory card or plug your camera into it and it copies everything on the card. Then once I get home I can view and import the photos onto my computer. Does this exist? Other ideas for backing up, without a computer?