Files and folders previously uploaded via the first MacBook are deleted as soon as the second MacBook goes online.

Putting files via browser works for both machines. Both machines sync time and location via internet. The personal settings on my Microsoft account are set correctly to Brazil, however I did not select a timezone.

Skydrive makes a lot of sense to me as long as it does not delete files I want to share!!

How can I put this second machine back to normal??