How to take backup of an entire website easily?

Say you want to bacjk up your blog or create a local copy of an entire directory of a website for archiving or reading later .The following is the procedure to save all the pages that exist at example.com website in a folder names example.com on your computer :

Download the Mac or windows version of wget from http://users.ugent.be/~bpuype/wget/ .After downloading the executable file wget.exe in Windows or /Applications/wget on the Mac.
To run wget launch a command line prompt , switch to the directory where wget is installed by typing cd C:\wget\
on Windows , or
cd /Applications/wget
on the Mac.

Then to mirror the website example.com type
wget -m http://example.com on the command prompt. The -m switch in the command stands for " mirror this site ". The whole website will be saved locally on your system.