I think we're making this a lot more complicated than it has to be. :crazy:
Be kind, remember these folks are completely new to this.
@ RoseDreamJ
You said all the data was backed up weekly? To what? Using what? On the Amiga, while you can use a dedicated backup program, creating backups really is as simple as copying files to another device and then copying them back if the need arises.
Do you have access to the backed up files? It sounds like they're elsewhere on the hard drive.
Can you describe the now-missing Main icon? Was it a white rectangular box with a little checkmark in it? That indicates a hard drive partition. Amiga drives can be accessed by either their device name or their volume name. It sounds like you formatted device DH2: which had the volume name of Main. Did anything else disappear from the desktop (we call it Workbench)? Those were probably files or programs on DH2: that had been "left out" for faster access. Formatting their home caused them to disappear.
It's also possible that Main was a drawer somewhere on DH2: that had been left out, in which case we still need to discover what volume name DH2: corresponded to.