Well, if you care about your website, you should have a backup of it. Losing your entire website is super easy to prevent by just keeping a copy of it on your own computer.
To answer your question: we do delete inactive accounts. We do send multiple warnings ahead of time, but the reactivation window isn’t that big.
But again, keeping your own backup prevents loss of important data. I can’t stress it enough: always keep your own backups.