This just happened to me as well. All my local files were deleted and it refuses to restore them. They were deleted from the onedrive cloud at least, so that’s good.
I’m afraid this happened to me too.
I’ll send the logs to insyncHQ
Hamster
And another one.
This evening, I suddenly found my entire local OneDrive folder empty.
The trigger might have been, that I renamed a link that pointed to “Images” in the OneDrive base folder.
First I did not think about InSync as being the culprit. Why should I? But I found each and every file and folder in the trash bin. Not just deleted, but recursively emptied inside out. You can’t do this by chance by just “clicking wrong”.
It was a PITA to get all the files out of the trash back to their original location.
But now InSync is refusing to recognize the content. It starts to scan, tries to sync a few file and then stalls. It declares the base folder as “empty”.
I’m really “not amused”. So how get the structure synced again without deleting everything again and try to download from the cloud? It’s quite a big folder…
And another one.
I’m now also affected by this issue. All local OneDrive files deleted. I just sent the log files to support and will see, what I can do to bring Insync back to life.
Hi @smallfreak! My deepest and most sincere apologies for what happened. Kindly refer to my response here to know how to put things back in order.
@Markus_Feiter My apologies as well for the ongoing issue 
I have responded to your email.
Deleting the OneDrive Account within InSync and recreating it in the same place did indeed help.
It took quite a while before all files and folders were tagged “synced” again, but the traffic was very moderate.
It took me some time until I found the correct “how to remove account” procedure as shown here.
The color decision “almost black text on totally black background” is improvable, especially if you have a well lit work place 
Hi @smallfreak, you are definitely not the first and last to point out the UI/UX improvement here. I’ll be taking note of this so we can line it up accordingly.
Thank you for updating on how the re-sync went. 