You can use Time Machine, the built-in backup feature of your Mac, to automatically back up all of your files, including apps, music, photos, email, documents, and system files. When you have a backup, you can restore files from your backup if the original files are ever deleted from your Mac, or the hard disk (or SSD) in your Mac is erased or replaced.
If there is anything you want to save, make sure you back it up first!First, unmount the device.Once the drive is unmounted, select the full disk in the left sidebar (labeled “UFD 3.0 Silicon” here)—not the sub-disk(s) under it (labeled “Untitled” here)—and click “Erase” in the top row of buttons.From the resulting dialog, format your device as “Mac OS Extended (Journaled)” and use the scheme “GUID Partition Map”. Click “Done” to continue.Now, you’re ready to install macOS Sierra on your external device. You can also give your device an appropriate name, if you want. Then click “Erase”.When the operation is complete, you will see the following message. https://browntk737.weebly.com/mac-os-external-usb-drive-wont-mount.html.
- In this case, if you have a reasonably new mac, it will ask you to connect to WiFi from the boot screen and put your Apple ID in. From there, it will download and install OS X from the App Store. After the install, it will ask you if you want to restore your data from time machine.
- Apr 01, 2020 Mac OS Extended (or HFS+) is still a good option for older drives, but only if you plan on using it with a Mac or for Time Machine backups. If you need a cross-platform option, consider using ExFAT for your drive instead—both Windows and macOS can read these drives without any.
Create a Time Machine backup
Here are the steps you need to take to recover an older macOS from a Time Machine backup: Start up your Mac and immediately hold down Command + R. Mac you can choose to boot from that drive. Jul 10, 2018 According to the last bullet on this page, external drives containing time machine backup should be bootable and appear as EFI Boot on the Startup Manager screen.My MBP late 2011 is running lion 10.7.5. I formatted a new external hard drive to HFS+ encrypted by erasing the drive using disk utility, and its map scheme became GUID automatically after the erasing operation.
To create backups with Time Machine, all you need is an external storage device. After you connect the device and select it as your backup disk, Time Machine automatically makes hourly backups for the past 24 hours, daily backups for the past month, and weekly backups for all previous months. The oldest backups are deleted when your backup disk is full.
Connect an external storage device
Connect one of the following external storage devices, sold separately. Learn more about backup disks that you can use with Time Machine.
- External drive connected to your Mac, such as a USB, Thunderbolt, or FireWire drive
- External drive connected to an AirPort Extreme Base Station (802.11ac model) or AirPort Time Capsule
- AirPort Time Capsule
- Mac shared as a Time Machine backup destination
- Network-attached storage (NAS) device that supports Time Machine over SMB
Select your storage device as the backup disk
When you connect an external drive directly to your Mac, you might be asked if you want to use the drive to back up with Time Machine. Select Encrypt Backup Disk (recommended), then click Use as Backup Disk.
An encrypted backup is accessible only to users with the password. Learn more about keeping your backup disk secure.
If Time Machine doesn't ask to use your drive, follow these steps to add it manually:
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- Open Time Machine preferences from the Time Machine menu in the menu bar. Or choose Apple () menu > System Preferences, then click Time Machine.
- Click Select Backup Disk (or Select Disk, or Add or Remove Backup Disk):
- Select your external drive from the list of available disks. Then select ”Encrypt backups” (recommended) and click Use Disk:
If the disk you selected isn't formatted as required by Time Machine, you're prompted to erase the disk first. Click Erase to proceed. This erases all information on the backup disk.
Enjoy the convenience of automatic backups
After you select a backup disk, Time Machine immediately begins making periodic backups—automatically and without further action by you. The first backup may take a long time, depending on how many files you have, but you can continue using your Mac while a backup is underway. Time Machine backs up only the files that changed since the previous backup, so future backups will be faster.
Mac Boot From Time Machine Drive
To start a backup manually, choose Back Up Now from the Time Machine menu in the menu bar. Use the same menu to check the status of a backup or skip a backup in progress.
Learn more
- If you back up to multiple disks, you can switch disks before entering Time Machine. Press and hold the Option key, then choose Browse Other Backup Disks from the Time Machine menu.
- To exclude items from your backup, open Time Machine preferences, click Options, then click the Add (+) button to add an item to be excluded. To stop excluding an item, such as an external hard drive, select the item and click the Remove (–) button.
- If using Time Machine to back up to a network disk, you can verify those backups to make sure they're in good condition. Press and hold Option, then choose Verify Backups from the Time Machine menu.
- In OS X Lion v10.7.3 or later, you can start up from your Time Machine disk, if necessary. Press and hold Option as your Mac starts up. When you see the Startup Manager screen, choose “EFI Boot” as the startup disk.
According to the last bullet on this page, external drives with time machine backup should be bootable and appear as EFI Boot on the Startup Manager screen. My MBP is running lion 10.7.5. I formatted a new external hard drive to HFS+ encrypted by erasing the drive using disk utility, and its map scheme became GUID automatically after the erasing operation. After time machine created a full backup on the drive, disk utility even shows it's bootable on its disk info page. However I still don't see an EFI Boot option on the startup manager screen nor on the startup disk preference screen. I'm not sure if it's because my MBP is too old or I missed some important step. Any advice would be appreciated.
By the way, backup content is fully accessible in macOS Recovery so the drive itself should be fine as well.
![Can Mac Os X Boot From A Time Machine Drive Can Mac Os X Boot From A Time Machine Drive](/uploads/1/3/3/8/133897503/816931370.jpg)
Boot Mac From Time Machine Drive
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