pink message "Space required on your C: drive: 5.0 GB" ?

The pink message refers to free space on the local C: drive, not to available OneDrive cloud storage.

When backing up folders with Windows Backup/OneDrive, files are first stored (or need working space) on the C: drive and then synced to OneDrive. If there is not enough free disk space locally, Windows shows a "Space required on your C: drive" warning even if there is plenty of OneDrive quota left.

To proceed:

1. Free up space on C: so that at least the required 5 GB is available:
   • Run Disk Clean-up (in Windows: Start > search for Disk Clean-up).
   • Remove temporary files and other unneeded items.
2. Optionally reduce what is stored locally by using OneDrive’s "Clear space" on files that are already synced so they become online-only.
3. After freeing space, try enabling the folder backup again in Settings > Accounts > Windows backup and toggle the desired folders.

If a "Disk full" type message appears when moving files into OneDrive, follow the same pattern: free local disk space first, move files into the OneDrive folder, then mark some items as online-only to reclaim local space.

References:

• Back up and restore with Windows Backup
• I'm getting a "Disk full" message in OneDrive
• My OneDrive says it's full