You can use the disk imaging program in Windows 7 to create an image of your present hdd and copy it to other mediums
such DVDs, flash drives, hdds, etc. The image can be used reinstall the contents onto a corrupted hdd or a new hdd to be
used in the same computer. The Windows 7 imaging / backup program is a stripped down version of Acronis. I know Seagate
and WD use Acronis for cloning and creating images.
OK I wasn't sure but it sounds like your saying Windows 7 has a built in disk cloning tool correct? The reason I want to clone Windows 7 is because I only have about seven more web activations otherwise I'll have to call Microsoft to activate it.
As long as it's installed on the same computer, no worries, and the best thing being, you'll unlikely ever have to speak with an agent. You'll just have to bring up a page with boxes of numbers, and when asked by the automated assistant to say or key these into the phone & verified, you'll be asked to type in some new ones in the empty boxes below this. The good thing is that you can use the Snipping Tool to save the screenshot of this, so that you can repeat the procedure yourself if needed w/out calling. This was an option presented to me just last week, so made a snapshot of the box, along with the numbers I filled the boxes with. Saved to an external drive where I store license keys & to a Flash drive with a similar folder. It's best to save this in this manner, in case a HDD goes bad & have to restore Windows to a new one (or SSD).
I've restored backup images 4-5+ years old (pre-SP1 images), and though at first would be greeted with a black screen with the watermark in the right corner, once updates were performed, followed by a reboot, all would then be OK. Have never had to call Microsoft over restoring a backup to the same computer, though this may not be the case with everyone.
Note that only a Full version copy of Windows can be used on different hardware, though a clean install will likely be needed, and probably the best option anyway. Even in the rare instance where the make/model of computer is the same, the computer will have a different hardware fingerprint.
Have never used Clonezilla to create a drive image, please let us know how it goes afterwards.
I use Macrium Reflect (WinPE) for both Windows & Linux imaging, it's free, easy to use, though when imaging drives with Linux, one must use the sector-by-sector backup process. It still compresses the image to some degree. Being that I have one SSD that dual boots Windows 7 Ultimate & Linux Mint 17, this is a great option to have. However, the ultimate test is when the image is needed, so far haven't restored a backup of Linux MInt in any fashion with Macrium, yet when the time comes that I do, will then be able to say for certain if it works or not.
If you're wanting to image Windows only, I highly recommend Macrium, since around 2007, have had only one image that wouldn't restore & this was a backup taken while Windows was running. Using the WinPE media, one doesn't have to worry over running Windows processes rendering the backup image useless.
Also I want to clone Windows 7 to a DVD because DVDs last longer then USB thumbdrives,
I agree with this & is why I create my recovery media sets to DVD's only, have lots of time on my hands & an hour to 90 minutes is worth the peace of mind. Some USB drives, particularly USB 3.0 models, doesn't boot into Recovery as it's supposed to, which is why though a bit slower, would use a USB 2.0 model, most of these are compatible if large enough. Though I still prefer DVD's for this task, they'll likely outlast the computer.
Have never imaged a computer to DVD's, though would recommend to grab a 50 or 100 count pack from Newegg on promo to hold down cost. Normally, I get 100 count sleeves from Newegg for $12.99 on promo with Free or 99 cent shipping. Though in past times, have seen others imaging their XP installs to DVD's, haven't seen this performed in this decade. At today's all time low cost of backup drives ($50-60 for a 1TiB model on promo), this is the better choice if in the budget. If you have a HDD docking station that'll accept both 2.5" & 3.5" SATA HDD's, you can get a 1TiB 'bare' drive (OEM with warranty) for as low as $39, though $45 is the norm, or if you have an extra 2.5" HDD around, you can get a USB 2.0 enclosure on eBay for less than $6. I have three of these, plus a USB 3.0 model that was $8.99. They're made of metal also, which helps to keep one running cool.
In the case that you have spare 3.5" SATA HDD's, a docking station would be a good & probably best choice, I cannot recommend an enclosure because the price for a quality one is over half that of a fully assembled backup drive on promo. Just mentioning these ideas because imaging to DVD's, plus the restore afterwards, will be very time consuming for Windows 7. Though the more these are compressed, the better.
Good Luck in your decision!