You can export all your Data from Mastodon in the settings "Export" function (it's *your* data after all). I was genuinely surprised, that my archive is already 597 MB and that I have have 3235 posts here already :)

I'm currently working on a desktop app, to display the contents of a Mastodon export (KDE-Frameworks based) to have a neat little viewer for it. Not sure ojn the name (yet)

I'll soon enable auto-delete for my data, so it's removed after 90 days.

@tuxbbₜᵤₓᵢ

Mastodon data export feature in the User Profile
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If you have a fediverse account, you can quote this note from your own instance. Search https://burningboard.net/users/Larvitz/statuses/114870772873240673 on your instance and quote it. (Note that quoting is not supported in Mastodon.)