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When asked if you want to replace the current backup disk or use both, select the Use Both option. This will enable backups to both drives concurrently.
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To add three or more backup destinations, select the Add or Remove Backup Disk option. You may need to scroll through the list of backup drives to find it.
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With multiple drives, Time Machine will make hourly backups as normal, backing up to the drive with the oldest backup first, so all drives remain as up-to-date as possible.
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If a second backup drive isn't connected, Time Machine will continue backing up to connected drives, and will automatically update the backup when the drive is reconnected, perfect for off-site or long-term backups!