Recently I upgraded my Mac to OS X Yosemite and after that all of my Pages files which were saved in iCloud in my MacBook are lost and I can't find them in in my MacBook or in icloud.com online.
Is there any way to find them? Or is there any folder in my computer or online which saved iCloud files before syncing?


The iCloud Drive directory is located within Mobile Documents. You can access iCloud Drive via Terminal with:

cd Library/Mobile\ Documents/


Note that the Mobile Documents directory could not be found in Finder. You can get a list of sub-directories in Mobile Documents by typing ls in Terminal. For example, the iCloud Drive directory for Pages.app is

cd Library/Mobile\ Documents/com~apple~pages

Try to find your documents in these directories. You may better keep offline to avoid iCloud syncing errors, if any, continue deleting your local files. If files are there, copy them out using cp.

If not, please try to log out your iCloud account in System Preference.app and re-log in. This enables OS X to re-fetch the iCloud files index and sync them again. However the chance it works is small, because your files are already missing on iCloud.com.

My guess is that some wrong operations delete all local iCloud Drive documents, and this change is synced to iCloud.com so all your online files are also deleted. The last solution would be to recover your files in iCloud Drive from a Time Machine backup.

Hope things go well!

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