Rolling out to Microsoft 365 work and school accounts, the new feature will let you use your files in OneDrive for the web even if you're offline.

Having space available on your PC's drive for files, data, and apps is essential. Instead of constantly storing your files on your drive, you can use OneDrive’s File On-Demand feature to help ...

Microsoft plans to launch Copilot for OneDrive, which will "learn" documents stored in OneDrive. This takes incredible resources to do on your PC, which might justify the cost.