What it means
Files On-Demand can show a file in File Explorer without storing its contents on the device. A blue cloud marks online-only: it needs an internet connection to open. A green check after opening a file means it is locally available now, but storage cleanup can later make it online-only. The solid green circle for Always keep on this device represents an explicit offline choice that uses local disk space.
A real-world example
Before a flight, a user sees a cloud icon beside their boarding documents and assumes File Explorer means the documents are saved locally. The laptop goes offline and the files cannot open. Marking them Always keep and testing offline would have avoided that failure.
What to do
Right-click only the needed files or folders, choose Always keep on this device, wait for download and test with networking off. Use Free up space after the trip if local copies are no longer needed.
The distinction that matters
Availability is not backup. Deleting a synchronized file can remove it from OneDrive too, and an always-available file can be affected by malware or accidental edits. Keep an independent copy of irreplaceable work. A file name visible offline does not prove its contents are present. Storage Sense may return ordinary locally available items to online-only, while the explicit Always keep choice is intended to persist. Check the icon after large sync changes.
Microsoft Files On-Demand
