The only reason I'm writing this post is to remind you that your bad decisions have consequences. I don't know who had the idea to break OneDrive sync for existing customers and then consequently make it impossible for them to restore from a backup, but that idea is the sole reason I'm quitting your product. Goodbye!

Hey @Angelos Petropoulos

Welcome to the forum!

We regret the unpleasant experience. Please be assured, we're here for any help. We didn't intent to trouble users with the One-Drive sync update, however, we had to address a long-awaited user's request to support One-Drive for Business. That required us to update and tweak a couple of APIs. Due to these architectural changes, the sync had to be re-setup. Please let us know if you need help with One-Drive sync. Here are some FAQ for more info.

Thanks.