Servers were hacked today at around 6pm [GMT+1]; fortunately, I have been able to restore a backup of My Math Forum that I made after the previous software update of last week. Therefore, all files shall be just as they were before the attack.
Additionally, the database has been untouched; thus, no data loss was incurred.
The attack was due to a sophisticated java intrusion on my personal computer which allowed the hackers to retrieve some sensitive data. I took the preliminary steps to guarantee the security of the forums and of the server where they are hosted; consequently, My Math Forum should now be safe.
However, its sister forums (My Computer Forum and My Finance Forum) are still temporarily unavailable due to some security issues (the matter will probably be resolved by tomorrow). Hopefully, I can confidently say that no data loss will be incurred since I also did a full backup last week following the software update.
I apologize for the temporary inconvenience and keep working towards the resolution of any outstanding issue.