I have a subscription to Office 365 which comes with a 1TB One Drive cloud storage so it makes sense to use it as a backup of my hard drive. I have been using MS Outlook for years with all my accounts hooked in as POP3 so all my emails currently reside on my PC hard disk. Is it risky to put my pst file on One Drive. By risky, I don't mean from a security point of view but from a stability point of view. In other words is there an unacceptable risk that a One Drive sync will corrupt my pst file?