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# 3.4 Burning Backups of CDs/DVDs

You can use DropDMG to create exact copies of CDs, DVDs, and Blu-ray discs, for example:

- Your macOS install discs.
- A bootable emergency CD for disk repair software such as DiskWarrior or Drive Genius.
- Video discs that you’ve created. (In this case, use the `.cdr` format instead of the `.dmg` format.)

To do this:

1. Go to the Configurations tab of DropDMG’s Preferences window and set DropDMG to create a read-only `.dmg` image.
2. Drag the CD or DVD icon onto the DropDMG window or use one of the other methods. DropDMG; it will create a device image of the disc and save it as a `.dmg` file.
3. Eject the disc.
4. Use the Burn… command to burn the `.dmg` file, making sure that Burn contents of disk images is selected.
5. DropDMG will ask you to insert a blank disc; after doing so, click the Burn button.

Tip: DVDs are faster to access than CDs. If you burn a DVD copy of an emergency boot CD, your Mac will boot approximately 25% faster from the backup than from the original CD. This can be a savings of a couple minutes.

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