Upgrading to Windows 8 was rather different to previous versions of the operating system – this time it could be done entirely online. You may well have decided to keep upgrade costs as low as possible by not buying a backup DVD. Here's how you can create your own.

To create your own DVD you'll need to download the installation files. Start by visiting the Windows Order Summary page and fill in the form with all of the details requested of you.

Unless you are particularly organized and took the step of printing out your order confirmation email after making your initial purchase, you probably won't have all of these details to hand straight away.

To track down the email, just search your inbox for 'Thanks for ordering Windows 8' and you'll find the relevant message easily.

Click Submit and you'll be taken to the summary of your order where you'll be invited to order a backup disc – but you can create your own free of charge.

At the bottom of the page you'll find a download link for Windows 8 – click this to grab a copy of the tiny installer.

Double click the executable, enter your Windows 8 product key and click Next.

Verify that the correct version of Windows 8 has been detected for you and click Next.

Now you'll have to wait while the required setup files are downloaded before you can continue.

Once this has been done, select the 'Install by creating media' option and click Next.

You can then choose between creating a USB installer, or creating an ISO file that can be burned to DVD.

If you have a USB drive with a capacity of 3GB or more, select the 'USB flash drive' option and click Next.

Select your USB drive from the list and click Next. Bear in mind that any data currently stored on the drive will be erased so make sure you have a backup.

Once the files have been deleted, you can sit back while the installation files are copied into place.

If you prefer to go down the more traditional route of creating an installation DVD, you should select the 'ISO file' option instead and then click Save.

Choose where to save the ISO file, click Save and then wait while the image is created for you.

Once this is done, insert a blank DVD and click the 'Open DVD burner' link, make sure your DVD burner is selected from the list of drives and click Burn.

When the disc has been created, be sure to label it accordingly.

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