Here is the complete announcement: https://commaful.notion.site/commaful/A-Heartfelt-Goodbye-and-a-New-Beginning-at-Commaful-a31080180fa647f5ad69eac89fa6b532
Commaful is a website where you could post short (really short) stories to with pictures. I've used it in the past to post my lyrics to my music but otherwise didn't really interact with it. Aside from poetry and short stories the website also contains a ton of shortform fanfiction.
I'm assuming a full backup wouldn't be that big (it's literally just text and some images + a lot of people using the same stock images). I just downloaded all my stories and it came to about 9mb (against 20 or so stories).