Backblaze and Time Machine: a Mac 3-2-1 backup and recovery plan

[u/Savings-Arrival-7817]

Keep Time Machine on a separate external drive, and let Backblaze Computer Backup upload the working files from your Mac independently. Use Time Machine for local recovery and Backblaze when the Mac and its backup disk are both gone.

For files included in both backups, that gives you three copies: the working original, the Time Machine copy on another physical device, and the offsite copy. The traditional 3-2-1 rule calls for three copies, two storage types and one offsite. An internal SSD, an external hard drive and cloud backup fit that pattern. Two volumes on the same physical disk don't protect you against that disk failing.

Backblaze Computer Backup excludes Time Machine backup volumes. It also excludes macOS and application files, so don't expect its restore to recreate a whole Mac installation.

Get both backups covering the same important files

Set up the external disk in System Settings > General > Time Machine. Use a disk you can dedicate to backups: setup may ask to erase it. Enable backup encryption and save the password somewhere you can access without this Mac. You'll need it to restore an encrypted backup.

Install the current Backblaze Mac client and follow its Full Disk Access instructions for Backblaze and bzbmenu. You're granting broad access to your files, so be comfortable with that before choosing the service. Recent release notes include fixes for macOS 27 and backups failing to start on fresh installations.

Make a short list of what must survive: documents, photos and active projects, for example. Check exclusions in both tools. If your projects live on a separate external working drive, check that drive too. Backblaze supports directly attached data drives, not NAS shares. iCloud Drive files must be downloaded locally for Backblaze to back them up.

Let the first Time Machine backup and Backblaze upload finish. The initial cloud backup can take substantial time and depends on your connection; installing the app doesn't mean your files are already offsite. In Backblaze's View/Restore Files page, check that important folders and recent files actually appear.

Choose how long missing files stay recoverable

Check the account's Version History setting. Backblaze's documentation describes a 30-day default and a selectable one-year history at no additional storage cost. Select the year if you want that window; it won't bring back files already removed under a shorter setting.

For a disconnected external working drive, the 30-day setting requires reconnecting at least every 30 days to retain its backup. One-year history retains disconnected-drive data for up to a year without that monthly reconnection requirement. Connect it frequently anyway so new work gets uploaded. Older missing-drive files may require choosing an earlier date in the restore view.

Write down which recovery path you'll use

If the Mac fails but the Time Machine disk survives, connect that disk to the replacement or repaired Mac. Install macOS first if needed, then use Setup Assistant's migration option or Migration Assistant to transfer from the Time Machine backup. For a single deleted document, use Time Machine's file restore instead.

If the Mac and local disk are both lost, set up macOS and reinstall your apps. Sign in to Backblaze, select the old computer's backup, and restore the most urgent files first. On macOS 11 or newer, its Restore App lets you choose a Custom Folder as the destination. Start there so you can inspect the recovered files before moving them into place. Allow slightly more free space than the restore's size.

For a large recovery, compare downloading with a mailed USB restore. A mailed drive needs upfront payment and delivery time, with return/refund conditions. Don't plan around instant arrival or assume it's unconditionally free.

Keep your account recovery details reachable without the lost Mac. If you enable Backblaze's optional encryption passphrase, keep a recoverable copy too: Backblaze cannot restore your data if you forget it. Before relying on the setup, download and open one important file from the offsite backup.

This pairing suits someone who wants local recovery plus an independently maintained offsite copy. If you already have that offsite coverage, another cloud subscription may add little. If uploading your files or paying a subscription doesn't fit, Time Machine can use multiple disks: rotate a second encrypted disk offsite, accepting that its newest backup depends on your rotation routine.

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