There is a tendency to conflate "backup" and "archive", both generally and in this thread. They have different requirements.
Backups should enable quick restore of a full operating image with all the necessary system level attributes. They concerned with SLA and uptime and outage and data loss window criteria. Archives are usually much more concerned with application data, which may have been specially prepared for the future user of the archive. Portability is often more important here, both in archive format but also in data schema within, even at the expense of some kinds of technical integrity or completeness (e.g. ACLs). Adding regulatory requirements into the mix further complicates matters. If one solution can address the union of all requirements, then you're in luck, but that's not always the case. Sometimes the best way to resolve the tension is to save the data differently for different purposes. -- Dan.
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