People below attempting to do what Mastodon doesn't do.... VIEW BACKUPS! who would want for such a thing... !
So anyway the makers of Mastodon didn't add a human readable export - lol ?!!). Valiant efforts below:

1/ @meowViewer = meowViewer
https://toot.cafe/@meowViewer

2/ https://bovine.social/mastodon/ using buffalo-components via https://www.npmjs.com/package/buffalo-components) to create a viewable list from the outbox.json
* BUT NOT PICTURES *
(SOURCE = https://codeberg.org/helge/fediverse-projects)

3/ Manually edit the #JSON ?
https://mastodon.online/@almodozo/109481007387299591
https://qoto.org/@freeschool/112877661754738876

4/ A few #RSS or #Wordpress or Hugo / Static exporting ways
CHECK HASHTAGS ABOVE OR
@pfefferle 's #activitypub #WordPress plugin
https://wordpress.org/plugins/activitypub/

<<< ADD TO THIS LIST PLEASE >>>

4/ You own instance + replacing posts file with new? (IS IT POSSIBLE?)

5/ .... ?

#Question - #FAQ or #FAK ?

❓ How to #move #server ? ❓

❗ Answer (in short) you can't take your data with you ! ❗