1. Posts are not lost, only the special characters inside are subsituted with question marks. I'm also quite upset, but can live with it.
2. Imagine losing all content (and I have only partial backups on my home server, no RAID or such security) three years later. Then ALL posts of the last TEN years would be lost. I don't want to risk such a thing to happen, and this is worth some money and question marks in my opinion.
3. - if you removed index.php from the end of the link, you get redirected.