Sandra in Sydney wrote: what if it happens again, can you copy valuable stuff & park it elsewhere?

Can anybody who has experience of Facebook answer Sandra's question?

I imagine most stuff people post to FB is ephemeral, and they would not care - maybe not notice - if it vanished. But if you do value some thread, or however FB organises content, how can you export it in a usable form?

When I ran a Wordpress blog, and also a Flickr site, I was able to export everything as a backup.