Cloud accounts · Cloud apps on your Mac
What's the difference between selective sync and online-only files?
Short answer: Selective sync hides unticked folders from this Mac entirely; online-only keeps everything visible in Finder but downloads files only when you open them.
Selective sync decides which folders appear on your Mac at all; online-only keeps every folder visible but leaves the contents in the cloud until you open them.
- Selective sync — folders you untick aren't on this Mac. They're safe in your account but you won't see them in Finder, and opening one means changing the setting or using the provider's website.
- Online-only — everything is visible in Finder; files download when you open them and can be freed again afterwards.
Online-only is the friendlier way to save space for most people, because nothing disappears from view. Which options you get depends on the provider and app version.
If you want old cloud files on your external drive rather than in the account at all, copy or move them with Data Transfers.