Can you boot mac from time machine

How to select a different startup disk

I have an unused external 1TB drive. My new internal HD currently reports Am thinking that once I have a separate TM external drive which seems to be the reco that I can erase the old bootable clone from the old external hard drive and create a new bootable clone of the current system there? Or will it not do that bc the new internal is 1TB even though the actual usage on it is far less??

I guess for right this moment I want TM to start running. If I need to purchase another external HD I will. Yes and yes to both those questions. But Time Machine will start deleting older backups when the drive is full.

How to Restore Your Mac With Time Machine

So the larger the drive, the further back the backups will go. Really helpful.

I also recommend that you can use your old PC act as the external disk. Use an application called Mac time capsule, it enables time machine backup mac to pc. You can download the software from many download website. I read that some are not able to boot macs. I have two old Seagate drives that connect via USB2. Will they work? I have done it a while back on for Windows Server for Admins. You could create a deployable backup of a machine that only re-ran the last few OS installations steps of HW discovery when you started it up on a new machine. I did copious or so I thought research on how to proceed and went with the SuperDuper clone route.

Everything worked great…until I connected to TimeMachine. It deleted ALL of my old backups some of which went back years!! The backup requires I bought a new external HD yesterday and will be using this from now on for TimeMachine so this is all semantics but what went wrong? Nobody ever said to expect or plan for this. Thanks for any insights you can provide. Yes it tries to start a new set of backups if you replace your drive.

Step One: Boot Into Recovery Mode

This may help. Thanks for your reply. I checked in the backups. As a comparison, a separate external drive I use for my work Mac has multiple folders dated for each backup. Oh well, live and learn.


  • Use Startup Disk preferences.
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  • Can't boot from time machine disk | MacRumors Forums;

I have a TM external backup from earlier today but nothing cloned from internal HD, so not sure how I can get the internal HD back as a Startup volume to boot from. Boot into recovery mode http: Otherwise get to a friends mac and make a bootable usb stick. Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement.


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macos - Boot from time machine backup - Ask Different

Risks are inherent in the use of the Internet. Contact the vendor for additional information. Other company and product names may be trademarks of their respective owners. How to select a different startup disk If you have another startup disk with a compatible operating system, your Mac can start up from that disk instead of your current startup disk.

How to boot from an external drive that contains time machine backup?

Use Startup Disk preferences When you use Startup Disk preferences to select a startup disk, your Mac starts up from that disk until you choose a different one. Select your startup disk, then restart your Mac. Press and hold the Option key immediately after turning on or restarting your Mac. If your Mac is protected by a firmware password , you can release the key when you're asked to enter the password.

Use Startup Manager

Igor Igor 6 2. Macs won't boot from MBR.


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Tetsujin it is formatted on GUID. JBis but Apple says you can at the bottom of this page support. Igor According to what? JBis sorry I accidentally hit return before I pasted the link. Please see above. Sign up or log in Sign up using Google.