Errors installing nginx on Linux- wheezy

I have a remote server(Linux debian version: 7.8), which is not connected to outside world due to some security issues at my company. For this wheezy os: I see only version available for nginx is : 1.2.1-2.2+wheezy4, But there is no etag support in this version.

I wanted to upgrade it but there is no higher version available in wheezy, so I downloaded deb file for 1.6.2-5+deb8u1~bpo70+1 for wheezy-backports, uploaded to the server and tried installing it. But I got this error:

> sudo dpkg -i nginx-full_1.6.2-5+deb8u1-bpo70+1_amd64.deb

dpkg: dependency problems prevent configuration of nginx-full:
 nginx-full depends on nginx-common (= 1.6.2-5+deb8u1~bpo70+1); however:
  Package nginx-common is not installed.

dpkg: error processing nginx-full (--install):
 dependency problems - leaving unconfigured

So I downloaded deb file for nginx-common for wheezy-backports, and tried to install it but then I got this error:

>sudo dpkg -i nginx-common_1.6.2-5+deb8u1-bpo70+1_all.deb 

dpkg: dependency problems prevent configuration of nginx-common:
 nginx-common depends on init-system-helpers (>= 1.18~); however:
  Package init-system-helpers is not installed.

dpkg: error processing nginx-common (--install):
 dependency problems - leaving unconfigured
Processing triggers for man-db ...
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory

I downloaded init-system-helpers_1.34_all.deb, and tried installing it, but:

>sudo dpkg -i init-system-helpers_1.34_all.deb

dpkg: regarding init-system-helpers_1.34_all.deb containing init-system-helpers:
 init-system-helpers breaks sysvinit-utils (<< 2.88dsf-59.3~)
  sysvinit-utils (version 2.88dsf-41+deb7u1) is present and installed.

dpkg: error processing init-system-helpers_1.34_all.deb (--install):
 installing init-system-helpers would break sysvinit-utils, and
 deconfiguration is not permitted (--auto-deconfigure might help)
Errors were encountered while processing:
 init-system-helpers_1.34_all.deb

I am not getting further what to do, Am I doing something wring and these is some better way to do it?

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