I was using my Pages app working on a document that I started last week. I had hours invested in the project. It was 21 pages long. This morning, I opened the document and found that, inexplicably, the document had reverted back to the first version of the document, only 2 pages long. I lost hours and hours of work. It's as if it went back to the first day I started working on it a week ago. I had not intentionally deleted anything. There is no explanation for this. And, when it made this change, it instantaneously synched to the Cloud and my others devices lost the work as well. I've never seen this. Fortunately, I had made a duplicate version in Pages for another purpose, so I did not have to rewrite the whole project (would rather pull my teeth with pliers). But I'm scared now NOT to duplicate every important Pages document I have, which seems silly and a waste of space. But, I will definitely do it. Any ideas what the heck happened?