Backup not visible on drive

Hi I backed up my Dwarf according to the wiki guidelines. Instead of a USB stick, I used my USB flash hard drive. The process went ok, and finalized that I can savely disconnect my disk. However, when checking the diskdrive I could not see any data written to it, also not in the hidden files. Is this normal behavior?

Seems like a behavior of dying usb flash / sd card disk to me.
I mean, it is quite typical symptom I’d seen more than once - that files you’ve just written (seemingly well) disappear when you reconnect the drive. I would check drive separately on pc or try different drive.

Yes, another drive works, thanks!