![]() The System volume is also read-only, so malicious software cannot modify the operating system, whereas the Data volume that contains your files remains read-write so you can install apps and create and modify documents. The two volumes appear as a single entity in the Finder and wherever you might select or navigate files. A System volume holds all the files macOS needs to operate, while the Data volume contains only your data. In 10.15 Catalina, Apple introduced APFS volume groups, a way of bundling separate volumes together to create a bootable macOS. ![]() Why Bootable Duplicates Have Become Difficult to Make And once we’ve done that, we can reassess the role of a bootable duplicate in a modern backup strategy. To understand why this seemingly simple task-just read all the data from one drive and write it to another-is causing such consternation, we need to step back briefly. That’s the complexity of creating a bootable duplicate of your startup volume, also known as a clone. However, there is one general concern that has caused us to hesitate to recommend upgrading. Is it time to upgrade to macOS 11 Big Sur? I’ll write more about that soon. The Role of Bootable Duplicates in a Modern Backup Strategy #1665: Important OS security updates, abusive Web notifications, solve myopia with an iPhone, Self Service Repair.#1666: Air quality websites and apps, The Password Game.#1667: OS Rapid Security Responses, 1Password and 2FA, using Siri to request music.#1668: Updated Rapid Security Responses, OS public betas, screen saver bug fixed, “Red Team Blues” book review.#1669: OS security updates, ambiguity of emoji, small business payments with Melio, Twitter now X. ![]()
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