How much is this site is secure? ENOUGH
If site will be attack from a beginner using Kali Linux, there will be no problem

Instead, if I run over the dog of Anonymous group... you know what I mean!

Consider those:

• Server is not vulnerable to known vulnerabilies (point up: KNOWN!!!)
• Server does NOT contanin sensible data
• I'm NOT a famous guy

All of this harangue just to say:
the server should not be an interesting target...
...no one should waste his time trying to crack it