Windows
3 curated resources, easiest first.
Explains why a nearly full drive slows a PC and blocks updates, and lists methods to reclaim space, to try in order while rechecking free space after each. Options include Storage Sense, cleanup recommendations and OneDrive Files On-Demand.
What to do when Windows says there is not enough room for an update. It shows how to clear space with Storage Sense and cleanup recommendations, or to use a temporary external drive.
Describes how Files On-Demand shows all your cloud files in File Explorer without storing them all locally. You can mark files as online-only to free space or keep chosen ones available offline.