How do companies backup a Jira site in a generic format?

[Ganthe_ Yash]

I am aware that a Jira cloud site can be backedup in a native format as described at 

Export data from Jira Cloud | Atlassian Support.

I believe this can then be used to set up a Jira site locally using Jira data center.

However, I am looking for a way to backup a Jira site in a standard format such as CSV or XML or JSON so that it can be imported into a different tool other than Jira. This may be useful in the event of a temporary outage of Jira cloud and an executive decision to use self-host the ticketing system on a different platform. 

Is there any such practice or approach?

[Matt Doar _Adaptavist_]

There are a number of apps listed that do this:

https://marketplace.atlassian.com/search?query=cloud+backup&hosting=cloud

These are for backup, not necessarily for migration to Jira DC or a different product