The drawback is, they’re relatively small compared to the amount of data we want to back up. The biggest advantage to these destinations is that once written, they cannot be modified, and they’re disconnected from the computer once the backup is complete, so they’re not impacted by any subsequent machine failures. Offline media - typically CDs and DVDs, but this might also include flash media - used to be a common form of backup. Some of the differences boil down to convenience. Short summary: Backing up to a second internal drive is a surprisingly reasonable choice, and shares most of the same characteristics as backing up to an external drive. Unfortunately, that makes the drive easier to steal. An external drive is quickly and easily replaced, making it easy to upgrade or swap out as needed.This means that certain types of electrical failures that might damage an internal drive might not damage an external drive. An external drive is more electrically isolated from system.In addition, some alternate means of backing up that data needs to be considered. How that usage impacts backups will vary, but typically, the impact is reduced disk space for backups. Thus it may be more likely to be used for day-to-day things, as well as backups. Most of the pros and cons of the external-drive scenario above still apply. The only real difference between backing up to a second internal drive versus an external drive is the connection to and location of the drive. ![]() Backing up to a different partition on the same drive is exactly the same as backing up to the same drive, as discussed above. This is backing up to a second, physically distinct drive inside your machine. That’s a long list of pros without too many cons.
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