So I just realized a couple of my proxy sites got hacked today. I don't pay much attention to them, so they've been down for a few days now. One of them is in my signature. I don't have any backups since I reformatted some time ago. What do I do from here?
Along with this have you checked the contents of your directory? Chances are the files are still there. Most time these hackers merely modify or replace your home page, and generally leave some back door for other activities like a repository for files, etc.
Check with your providers to see if they have any backups. If so see when the latest one was pulled and go from there. If not, your probably out of luck.
Meh, sometimes the hackers will leave your files and just deface your site.. perhaps you could just get your hosting provider to reset your login information (assuming that's been changed) and then you can go from there -- checking if the files were actually deleted. Otherwise, yeah, your best bet would be to ask your provider if they have backups of your site.
The biggest concern you have at this point is HOW they got in, i assume they have injected malicious code? Check your page's source code for malicious code, use a web scanner if possible. Backups will assist with the recovery, however the vulnerability needs to be resolved.
first and foremost, you need to fix your security issue, I'd worry about a backup after that. If you don't they'll just come back and hack your site again.