[acdha]

Again, there are people who've lost data and in some of those cases it was even caused by Dropbox — as opposed to the hardware failures or human errors which are often attributed to a service like Dropbox because that's what first made the problem visible — but that's still anecdotal rather than proof of widespread problem and, going back to the topic at hand, it doesn't tell us that the answer is to avoid installing updates. For a widely deployed consumer app, a significant fraction of the work will be defensive coding to reduce the impact of problems on the client and holding back updates will actually increase someone's exposure interval.