Hello,
I just installed JMCenter 34.0.19.
As usual, I first try to make a backup of my datas (Ctrl+Shift+B).
The dialog box opened behave asked for path and filename. Good.
Problem is : once validation, a messagebox style "File not found" appeared, and backup operation didn't work.
Seems that the "Save" dialogbox's result is consider as "Open" or "Restore" dialogbox's process.