i am sure you could restore them..did you try to?I almost lost all my files while using OneDrive.
I shared my whole Documents folder on OneDrive. The original Windows folder disappeared and instead it was found on Users/OneDrive/Documents. I decided to stop using it, and removed account and uninstalled OneDrive --> Result? It deleted ALL the files I got.
Fortunately, I had just synced everything on MEGA and I could recover everything. If I hadn´t use MEGA I would have lost everything.
For me, it is a enoughly big reason to say no to OneDrive. I want a sync tool that doesn't mess up my folders, and specially, that doesn't delete my data if I stop using it.
Then my vote goes for Google Drive