For me this highlights, for what for me is, the fact that NoSQL databases are not replacements for relational databases and have totally different operational profiles. This may mean that backups are superfluous (may, MAY!!!) but, of course, it depends.

As data professionals (DBAs, developers, architects of various types etc.) we need to consider data backup NOT database backup. I make this distinction because we need to consider why a backup is needed e.g. it may be "good enough" to generate it or even lose it - these are not offered as THE choices, just possible ones amongst many.