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I have a suggestion for protecting users from ransomware attacks through Mozy backup.
simply, when ransomware changes a file, it encrypts the entire file so when Mozy comes to back it up, its load suddenly increases - instead of a small delta, it now has to backup an entire file. Mozy could alert the user when this happens, either before performing the backup (ie to also save the user's upload bandwidth) or afterwards so the user can check and restore old, good, files before they are lost from the 30day backup history.
I imagine Mozy could pop a dialog or a status-bar icon when it detects a file's delta is not small (ie if the diff results were equal to or greater than the last file size for example), and let the user flag the file as a once-off full change (eg a file the user has replaced with the same name), or to ignore (if the file is going to be fully replaced regularly) for future backups.
Looking at my backup history, there are a lot of files that are changed in small ways, browser DBs for example, but the backup that is uploaded is tiny in comparison. I would love to know if a file I expect to be never changing gets replaced without my knowledge - by a ransomware attack for example - so I can deal with it before it becomes a problem.