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I'm using latest version of Raspbian from http://downloads.raspberrypi.org/raspbian_latest
I've made changes to this image, can an image copy be taken which includes all OS changes made to Raspbian and copied to another MicroSD card ? So if current one fails I use card used to make copy ?
You can make an image backup using Win32 Disk Imager or other similar software like it.
If you want to make a backup image of an operational system, I would advise you to use dd. An important thing to consider here is to shut down all running processes before you make the backup using dd so as to make sure nothing is being written/read from the SD card. Common processes to shut down would be Apache/Nginx, MySQL server and others like it.
I personally use the following command to run a backup of the SD card every night using cron and copy it to a mounted External HDD
sudo dd if=/dev/mmcblk0 bs=4096 | pv -s 7761M | sudo dd bs=4096 of=/media/NASDRIVE/backup.img
In the above code, /dev/mmcblk0 is the SD card and /media/NASDRIVE/backup.img is the External HDD path to which dd writes the backup image. You may omit the pv -s 7761M part of the code but it shows a nice progress bar while backup is running.
I use dd on my Mac:
sudo dd if='/dev/rdisk<disk number>' of='image.dmg'
rdisk is quicker than disk.
Since there is no OS information available for the computer which you are going to back up the SD Card, I can suggest to have a look on:
https://www.raspberrypi.org/documentation/installation/installing-images/
If you are a MAC user, Apple Pi Baker might help you as well.
