If you are wanting to backup your system without ANY monetary investment, it’s not likely going to happen.
You will either need to purchase more disk and/or some backup software.
If you have and extra server available, you can use FTP to send over files to back them up.
With the cost of backup services these days, I would investigate them. Not only do you get the data backed up, but it is automatic and you do not have to worry about it.
Carbonite seems to have a good reputation.
The Q is about to free / without use 3rd party SW to back up Windows 7! Okay.
Windows 7 has an integrated backup solution which can be found Control Panel. Of course, prior versions of Windows also has backup utility, but now it is more improved in Windows 7.
You may invoke Backup And Restore from Control Panel or by typing Backup in the Search box on the Start menu. It is possible to take back up files to a local hard disk / a removable disk (like cd or dvd) / another computer on the network.
By doing open Control Panel > System and Security > Backup your computer option. On left pane, open the link “Create an image backup”.
Though the above procedure is very much sure and completely ok, you may also download and use for more enhancement and they r all completely free to download & use…..
Don’t worry, they are all free to use!
Remember, if you have more money you may invest it to get better solution. Though u asked for without purchase any sw, i.e. free, that is why I am providing these. It is universally known that, if u provide money for any good purpose, you should get always better way even a best option.