In Windows PCs the backup is saved in  folder Documents>Fujifilm>Conditions. If you open this folder in a window before you start the backup you'll see the backup file appear in the window. It's almost instantaneous. It's a confidence booster. I don't remember X-Aquire giving any indication that backup has completed. The backup files include the date and the camera make so if you have two Fuji cameras they all go in the same folder. New backups do not over-write the older ones so you can restore an older one if you should so wish. Simon  

Hi, thanks for getting back to me. It's a shame because my X-Pro1 works perfectly except for the aperture with the 27mm lens. I think it would be better to switch to the new WR version that allows aperture changes with the ring. Thanks for your help.

I have the same issue on my X-Pro 1 and can no longer use lenses with no aperture ring. I contacted Fuji Tech several years ago and was told the camera would have to be disassembled and the mother board replaced at a couple hundred dollars. I was also told Fuji would no longer be repairing X-P1 as they stopped making parts for them. I did not check to see if any third party repair shops could fix it. Everything else on the camera works fine.

Nobody knows it? 

Thanks for answering my question! About this one item -- why is it better to do this with the camera on? Just curious.