There are services like Dropbox, Google Drive, and One Drive which allows you to sync your files across multiple devices. One thing all of these providers lack is privacy. Because your files are on someone's computer, you risk them making mistakes like what Dropbox had a history of doing.
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Something that has become popular in recent times is messaging clients like facebook Messenger, Apple Messages, WhatsApp, and Hangouts. The issue is not all of these systems are secure.
Issues with popular methods: