Never worry about which computer has the latest file
A file saved on your computer is automatically backed up to the cloud too, so you can open the exact same file right away from another computer or your phone.
Free up local disk space without losing access
A "Files On-Demand" style setting keeps a placeholder for every cloud file visible locally without actually downloading it, so your drive shows your full library while only using disk space for the files you actually open.
Frequently Asked Questions
What happens if two people edit the same file at the same time?
OneDrive typically saves both versions separately as a conflict copy so nothing is lost, and you can then decide which version to keep.
Does OneDrive sync work the same way on a Mac?
Yes -- the OneDrive desktop app is available for Mac too and works the same way, syncing chosen folders between your computer and the cloud.