OneDrive deleted local files and started syncing old files !

Yes indeed. The unforgivable aspect of the user experience here is the combination of

A) promoting it very heavily (to the point of implying it is a necessity) during system installation

B) Failing to convey the implications that you once and for all WILL have to trust microsoft to keep your files for you. Fineprint in legalities inside a EULA if by far not enuogh this should be front-and-center when installing a windows machine, and  there should be a better way to create a classic windows account than unplugging the network cable at install time!!

C) It is irreversible for a normal user, because you immediatley lose the ability to tell where your data is, permanently, and hours of searching for help turns out no official process for actually getting it turned off once and for all.

D) deleting the online copies that mistakenly got leaked into microsofts servers and should not be there immediately deletes the same ORIGINAL files in your local drive, which is highly likely to lead to permanent data loss for average people. I lost 100 gigs of my original photos to this mistake - "1: Oh its uploading everything, not just the docuents folder -  that shouldnt happen!  2: turn off syncing, 3: delete all that got uploaded. 4. turn on syncing again., 5; two days later -"where the hell did my photos go?"   6: restore the backup from external drive.  7: omg it's uploading again...  (rinse and repeat)" If i hadnt had an external backup of my own, enabling onedrive backup would have lead to losing 15 years of family photos permanently in my case. not acceptable.

Something similar happened to me.  Thankfully I didn't have much important work on this PC.  It's a relatively new computer, but I noticed that my wallpapers were missing and screensaver had vanished.  Closer inspection found that all of my local files had been deleted and moved to the cloud.  Everything in OneDrive was set to keep all files local, but even after syncing the folders I still could not access them locally.  I could only see my files when online.

This is a huge privacy and security violation.  I expect my local drive to contain the files I put there.  Instead OneDrive hijacked my PC, deleted and moved files, and didn't tell me anything about what it had done.  

I've been using iCloud with OS X and Google Drive for years.  They work great as online storage and backup of local files.  I particularly appreciate how iCloud becomes a separate location in the file system within OS X allowing easy access to files online while also doing backups of important folders on the local drive... like how a backup system should work.

OneDrive is a nightmare.  Backup software that destroys files, changes your local drive, forces files online, and leaves you in the dark about what it's doing.  You couldn't make a worse cloud storage system if you tried.  I'm thankful I found out how dangerous it is to my local file system before I put too many work files on this computer.

OneDrive is now fully disabled on this computer.  There's no way I'm giving it access to my system again.  You really messed this up Microsoft.

Im even worse off. I ahev two windows 10 pro machines, one swedish and one english version. Now I have three to four of each desktop icon, and three to four copies and growing of every file in Documents, in Pictures, in Music and so on -on both machines and on the schools onedrive. My personal things should never be on the schools onedrive in teh first place, and now its trying to upload 680 gigabytes to there and the number of gigs to go is growing. Documents is symlinked to Dokument, Pictures is symlinked to Bilder, - and back again - etc. and both laptops are doing their darndes best to copy one anothers changes. Its and endless loop and I cant stop it. There is no way to sync both machines to onedrive - which i want since al lscholl work is in onedrive, and I wan to be able to use whichever machine depending on the peripherlas I need - one has the webcam and external harddrives, the other has the scanner, printer and big moniitors. Im lucky to have backup on a USB drive, but htis will be a LOT of work to clean up and I will have to involve the school adins and apologise etc. Just because there are two different languages of windows on my machines. I dont get a choice to reinstall because both are OEM licenses(stickers on the machine). I will have to ask them to delete my entire account and recreate it from backups, and then choose one machine, afaict.

There are many Microsoft products that I really like; however, One Drive is not on that list. I've lost data due to OneDrive and it also merged and moved Desktops across three laptops I use - all of which took me hours to figure out and restore. One Drive also created problems with other important folders. My big picture solution to OneDrive is to back up my computers with Macrium Reflect, then unlink and uninstall OneDrive. Fortunately, most of my cloud storage is with Dropbox - a much smoother and more reliable product in my experience.

Same here. They aren't for work but I feel for this issue. I think I'm going back to google drive. -_-