we recommend using USB for backup. simply because most MIDI interfaces available today do not support large chunks of sysex data without producing errors. from what I know, transmission/reception of sysex dumps via MIDI works fine. it might be that there is a bug in the verify function. to be honest, you'd be the first one in 10 years who spotted it - but of course i cannot rule it out. feel free to contact support by email.
Thanks for information. I know a lot of interfaces introduces some errors during transmitting large pieces of SysEx data. That's why I need to "Verify" this with this not working for me feature. I'll contact with support with this topic. Thanks a lot for help.