A Microsoft file hosting and synchronization service.
I did not realize microsoft could remotely delete files that were saved onto my own computer- now I know. I deleted files from onedrive in order to use my email (storage was full but I don't use onedrive, it was just automatically taking all my stuff). It deleted all the files off my computer too. I have spent literally all day trying to fix this. The files are not in the recycling bin either on my computer or onedrive. I paid for 365 membership so that I could 'restore onedrive' to yesterday.
By default, the OneDrive storage synchronizes with files on your PC, which means that deleting in one location will delete in the other location as well (see https://support.microsoft.com/en-us/onedrive/sync-your-computer-s-files-and-folders-with-onedrive). As you know, there is an option to restore the entire OneDrive storage, but it is connected to a Microsoft 365 subscription (see https://support.microsoft.com/en-us/onedrive/restore-your-onedrive), so if you didn't have the subscription from the start, you won't be able to restore what was lost before you got the subscription.