Looked a bit deeper and found out i was wrong about the reason why size test
fails.

Fast and dirty source fix:
 In htsback.c at line 3201
 replace
  int size = fsize(back[i].url_sav);  // target size
 with
  char *buffass=OPT_GET_BUFF(opt);
  fass(buffass,back[i].url_sav,back[i].url_fil);//might have to move this up a
line to compile
  int size = fsize(buffass);


Add following:
void fass(char* buff, char *path, char *name)
{
	char c[]=".delayed";
	unsigned int l=strlen(path);
	char *ass_=buff+l-sizeof(c)+1;
	strcpy(buff,path);
	if(l>sizeof(c)	&&	strcmp(ass_,c)==0)
	{
		char *ass=buff+l;
		while(*ass!='/')
			*(ass--)=0;
		*(ass--)=0;
		fconcat(buff,buff,name);
	}
}


Have tryed with this for a while and seems to work fine.
Hopefully this help clearifying the problem and cause the source to be updated
with a clean solution making this app even greater.