@tc46wine
Hi
firstly, are you running a MAC or PC system?
I can only help on MACs...
I've been going through this BACKUP DATA LOAD ERROR nightmare myself and it was beyond frustrating.
It has worked before, but when I had to restore my XE4 in December 2023 I got the same error message.
I had intensive talks with the technical support of Fuji Germany and we could narrow it down to a incompatibility between the newest version of XAcquire and an older firmware of my XE4.
So all backups I had made in the past months were obsolete. 😫
What they told me: your cameras have to be on the latest firmware, as well as the latest version of XAcquire otherwise a backup is not working correctly.
One other thing you can check if you're working on a MAC: be sure to allow AcquireX to have access to docs and folders in your system settings -> security -> privacy
TBH FujiXAcquire is a lousy piece of software, badly written and yes it's free, but I'd rather be paying to have a fully functional software.
I now went another route and use the new FUJIXApp on my iPhone and make my backups there.
It's quick and easy and I even have several backups like for night photography, day photography in two versions.
Restoring is done in seconds and it works!
I know that does not solve your problem right now and I had to restore every single bit manually 😵💫
Hope that helps