Recently flashed my #Librem5 with byzantium. And wanted to restore the data for the apps I use on the #librem5 (podcasts, rss feed, mastodon account, online radios, email). I simply copied the directories of those apps from my laptop home folder to the #librem5 home folder, and it was all there, and all the apps worked.
Yes, I know that for linux users the idea of syncing data across home folders is normal. But it still feels kinda cool to be able to do that between a laptop and a phone.