A Microsoft file hosting and synchronization service.
I understand why paying for another set of Office apps feels wasteful. Unfortunately, there is no hidden upgrade that extends the same personal Microsoft 365 Basic account from 100 GB to 500 GB.
The most practical alternative is to keep only frequently used files in OneDrive and archive older photos, videos, or backups elsewhere. You can download folders from OneDrive to an external hard drive, verify that the files open correctly, and then delete the cloud copies to bring usage below 100 GB. The official instructions are available in Download files and folders from OneDrive or SharePoint.
For a large library, it is recommended that you use the OneDrive desktop app rather than downloading everything through a browser. OneDrive can also be set up on a compatible non-removable external drive, although regular removable USB drives are not supported as the live sync location. See Install OneDrive on an external drive.
Another option is moving the excess files to a different personal cloud-storage provider. I would not use the workplace OneDrive for personal archives unless the employer’s policy explicitly permits it, since access can be removed when employment ends.
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