backfill

 backfill  is the action of importing all your past posts, typically from a social media silo, into your own site.

Indieweb Examples

 * has used import to backfill posts from past silo sites including WordPress.com, Posterous, and Twitpic amongst others.
 * Peter Molnar has written about some of his backfill work as well as his reasons why.
 * used a custom script to backfill Instagram posts from a combination of the Instagram export and website scraping in June 2022
 * has written about backfilling from Facebook and Instagram

Facebook

 * ditchbook - a toolkit for taking a Facebook export and migrating selected content to your Micropub compatible website, including Micro.blog websites.

Instagram

 * Help page for importing Instagram to Micro.blog

Tumblr

 * Tumblr Importer - import Tumblr posts into a WordPress blog

Twitter

 * gist for extracting liked tweet URLs from tweetdeck — because as of 2022-11-19, twitter archives don’t seem to be available.
 * Tweet Nest - archived software that is no longer maintained, but may be useful for a developer to fork and update

WordPress

 * Help page for importing WordPress posts to Micro.blog

retro posting
A special form of backfill is the creation of back dated posts (retroposting) for content created before the web, or before you started blogging / publishing on the web. See:
 * throwback