The app that synchronizes multiple lemmy accounts so you can migrate and keep backup accounts across instances, it's opensource and free, currently working in android and windows.
It's in homologation now and anyone can test, any feedbacks are welcome as always.
I've been keeping an eye out for this as I've seen some previous updates from you, and as my instance went down briefly earlier today I was wondering how far along you've gotten.
To me this is a must have feature for Lemmy/fediverse in general. Decentralised is supposed to not only spread the work load but also guarantee access, however without an up to date profile on another instance it doesn't really work.