c/c++ programmer to backup whole hard disk

hey guys,

was searching net for software to backup hardive and found many of them but i want to code one of my own. will it be similar to copying file?? n i want copy of whole hard drive inculding structure and data like any typical hardrive backup software like GHOST. thanks

this code ws ment to copy file but as every thing in linux is treated as file it should work to copy hard drive so i passed argument /dev/sda but didnt seems to work.

#include<stdio.h>
#include<stdlib.h>
int main(int argc, char *argv[])
{
 const int buffsize=200; 
 FILE *infile,*outfile;
 char buffer[buffsize],op='n';
 int size,check=0,i,d,m;
 //inf=argv[1];
 //of=argv[2]; 
 /*
 printf("enter source file name: ");
 scanf("%s",inf);
 printf("enter destination file name: ");
 scanf("%s",of);
 */ 
  
 infile=fopen(argv[1],"r");
 outfile=fopen(argv[2],"r"); 
  
 if(infile==NULL)
 { 
  printf("\nERROR :: input does not exist\n");   
  check=1;
  return 0;
 }//end if 
 
 if(outfile!=NULL)
 {    
  printf("\nERROR :: output file already exist\n do you want to overwrite?? (y/n)");
  fflush(stdin);
  scanf("%c",&op);
  scanf("%c",&op);
  if(op=='n')
   check=1; 
 } 

 if(check==1)
 {
  exit(0);
 }
 
 outfile=fopen(argv[2],"w");
 
 fseek(infile,0,SEEK_END);
 size=ftell(infile);
 printf("size : %d\n",size);   
 rewind(infile);
 
 if(size > buffsize)
 { 
  m=size/buffsize;
  if(m==0) m=1; 
 
  d=size-(m*buffsize);  
  printf("\n");
  for(i=0;i<m;i++)
  {  
   fseek(infile,i*buffsize,SEEK_SET);
   fseek(outfile,i*buffsize,SEEK_SET);
   fread(buffer,buffsize,1,infile);    
   fwrite(buffer,buffsize,1,outfile);    
  }//end for
  fseek(infile,m*buffsize,SEEK_SET);
  fseek(outfile,0,SEEK_END);
  fread(buffer,d,1,infile);    
  fwrite(buffer,d,1,outfile); 
 }//end if
 else
 { 
  fread(buffer,size,1,infile);    
  fwrite(buffer,size,1,outfile);
 }//end else
  
 fclose(infile);
 fclose(outfile); 
}//end main