HACKED BY THE2ONE

My websites was just hacked 2 days ago. The description of the hack is this: once you go to my websites – a page appears with: “THIS WEBSITE HAS BEEN HACKED BY THE2ONE”, along with a skull and what seems to be arabic writing.

I was able to restore my sites to a previous backup which cost me a lot of work.

I am not sure if this will happen again – if anyones come across this unfortunate incident – please advise on precautions etc.