A Microsoft file hosting and synchronization service.
This is a serious problem.
I want to add that in my folder that is not synced with OneDrive, it is every single file that has been deleted, the folder structure is still intact, which obviously also shows that it is not something I have done myself.
The old files have suddenly showed up back in the synced folder, but it is the old version from when I initially deleted / moved them out of OneDrive, meaning that I have lost all recent work because of this.
How can this even happen?
Why would OneDrive delete files in folders that are not even synced with OneDrive.
My best guess is that after I moved a lot of files out of OneDrive, I saw a message saying that I had deleted a lot of files from OneDrive (I guess it saw them as deleted because they were moved), some mechanism most have decided to revert the action after X amount of days, even though I never asked for this to happen.
OneDrive has caused a gigantic mess and loss of lot of work.
To anyone reading this, stay away from OneDrive, it is not a mature product.