JohnWorks

Here’s a link to their website https://molly.im/ It also links to their GitHub. If you’d want to backup what you’d do is link molly to your iphone signal instance and then the Android client or molly android client of signal allows you to make local backups on device.

Restoring it back to the iPhone won’t be possible but there’s a backup at least. Or rather maybe with that recent change the article talks about it might be possible in the future but not currently afaik.

You can on Android. If you have an iPhone you can link using the molly signal fork on an android device and then backup using that.