What should be the best against solution unknown threat

I am waiting for the reply from community members please reply me as soon as possible . I have lost my website data. The cracker attacked  on my laptop and theft credentials details of my site.

As you have stated, you have added protection against attacks, but yes, it is not completely foolproof.  One of the best protections against virus attacks or ransomware attacks is a good solid backup. I recommend two actually. One locally, say to an external drive that you disconnect after each backup. I recommend daily backups, but weekly may suffice if you do not make a lot of changes on your machine. I also recommend an offsite backup program like Carbonite. I also find that Dropbox is a reasonable solution as well. They will backup your files to the cloud. Should you machine be attacked and data destroyed or locked up. you can restore it from the local copy if not attacked, or from the cloud copy if the local copy was also compromised.  

Webroot sales can help you wth proper virus protection, and they also sell Carbonite (which I use) as an cloud backup program. You can also investigate other cloud solutions to see how they compare.