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Question:

Which of the following is NOT a good way to back up a Linux (or any) desktop system?

A Make only monthly backups.
explanation

Making monthly backups is unlikely to be sufficient for most people. In a commercial context, it's critical to have a backup plan in place that takes into account how much data you're willing to lose and how long it would take to recover data if restoring from a backup was required. According to the 3-2-1 rule, you should have three backups on two distinct media, one of which should be off-site. It's also a good idea to keep backups distinct from your main system so that an infection in the main system doesn't damage the backup. Your backup strategy should involve regular verification that backups can be restored, which means that backups finish successfully and are not corrupted, and that your restore process works. Even emergency medical services perform practice runs from time to time to guarantee that they will be ready if a major incident occurs. You should as well. If an event occurs, you must ensure that you are restoring from the proper backups. If the person in charge of backups is unavailable for whatever reason, a well-documented backup system will make it easier for someone else to continue the process in their place and/or restore backups if necessary.

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