Results 1 to 8 of 8
  1. #1


    Member Since
    May 07, 2010
    Location
    UK
    Posts
    494
    Specs:
    2 21.5" iMacs 3.06 GHz Intel Core i3 500 Gb HD OS X 10.11.5; 2 iPads iOS 9.3.4 iPhones 4s iOS 9.3.4
    Backing uop with Time Machine
    Hey ho we're now a 2 iMac couple, both Senior Citizens! I have 2 1TB external drives and use them alternately to back up. Is there a way to back up both Macs to one drive? If not can I alternate the external drives between the 2 iMacs or are they dedicated?

  2. #2

    cwa107's Avatar
    Member Since
    Dec 20, 2006
    Location
    Lake Mary, Florida
    Posts
    26,943
    Specs:
    15" MBP, Core i7/2GHz, 8GB RAM, 480GB Crucial M500 SSD
    Generally it's a good idea to dedicate one drive to Time Machine. However, if you have enough space on the single drive, you could partition it and dedicate one partition to each iMac.

    So, since your iMacs have a 500GB drive each and you have 2 1TB externals, theoretically you could use the Partition tab in Disk Utility to split one of the drives into 2 500GB partitions. That should be enough to give you a decent backup and allow you to share it between the two machines.
    Liquid and computers don't mix. It might seem simple, but we see an incredible amount of people post here about spills. Keep drinks and other liquids away from your expensive electronics!

    https://youtu.be/KHZ8ek-6ccc

  3. #3


    Member Since
    May 07, 2010
    Location
    UK
    Posts
    494
    Specs:
    2 21.5" iMacs 3.06 GHz Intel Core i3 500 Gb HD OS X 10.11.5; 2 iPads iOS 9.3.4 iPhones 4s iOS 9.3.4
    Partitioning external hard drives.
    Quote Originally Posted by cwa107 View Post
    Generally it's a good idea to dedicate one drive to Time Machine. However, if you have enough space on the single drive, you could partition it and dedicate one partition to each iMac.

    So, since your iMacs have a 500GB drive each and you have 2 1TB externals, theoretically you could use the Partition tab in Disk Utility to split one of the drives into 2 500GB partitions. That should be enough to give you a decent backup and allow you to share it between the two machines.
    Thanks; I've done one and will try it out before doing the other one.

  4. #4


    Member Since
    May 07, 2010
    Location
    UK
    Posts
    494
    Specs:
    2 21.5" iMacs 3.06 GHz Intel Core i3 500 Gb HD OS X 10.11.5; 2 iPads iOS 9.3.4 iPhones 4s iOS 9.3.4
    Backing up 2 Macs to Time Machine
    Quote Originally Posted by cwa107 View Post
    Generally it's a good idea to dedicate one drive to Time Machine. However, if you have enough space on the single drive, you could partition it and dedicate one partition to each iMac.

    So, since your iMacs have a 500GB drive each and you have 2 1TB externals, theoretically you could use the Partition tab in Disk Utility to split one of the drives into 2 500GB partitions. That should be enough to give you a decent backup and allow you to share it between the two machines.
    I did as you said but have since been told by Applecare that you can back up 2 Macs to the same Time Machine. This seems to me a more satisfactory solution as one Mac may use up more capacity than another.

    For anybody else thinking of doing this you do of course have to eject from one Mac and connect to the next. If you have 2 external hard drives (I label them 1 & 2) you also have to go to System Preferences on the dock and click on Time Machine to get the option to choose the disk to use; otherwise it doesn't know that it's the current Time Machine. Don't try going staright to Time Machine on the dock as that takes you into the Time Machine 'universe'.

  5. #5

    cwa107's Avatar
    Member Since
    Dec 20, 2006
    Location
    Lake Mary, Florida
    Posts
    26,943
    Specs:
    15" MBP, Core i7/2GHz, 8GB RAM, 480GB Crucial M500 SSD
    Quote Originally Posted by Alwyn View Post
    I did as you said but have since been told by Applecare that you can back up 2 Macs to the same Time Machine. This seems to me a more satisfactory solution as one Mac may use up more capacity than another.

    For anybody else thinking of doing this you do of course have to eject from one Mac and connect to the next. If you have 2 external hard drives (I label them 1 & 2) you also have to go to System Preferences on the dock and click on Time Machine to get the option to choose the disk to use; otherwise it doesn't know that it's the current Time Machine. Don't try going staright to Time Machine on the dock as that takes you into the Time Machine 'universe'.
    That's interesting. Are you sure they said 'Time Machine' and not 'Time Capsule'?
    Liquid and computers don't mix. It might seem simple, but we see an incredible amount of people post here about spills. Keep drinks and other liquids away from your expensive electronics!

    https://youtu.be/KHZ8ek-6ccc

  6. #6


    Member Since
    May 07, 2010
    Location
    UK
    Posts
    494
    Specs:
    2 21.5" iMacs 3.06 GHz Intel Core i3 500 Gb HD OS X 10.11.5; 2 iPads iOS 9.3.4 iPhones 4s iOS 9.3.4
    De-partitioned external drives 'test drive'
    Quote Originally Posted by cwa107 View Post
    That's interesting. Are you sure they said 'Time Machine' and not 'Time Capsule'?
    Yes and I've de-partitioned both drives and test-driven one of them. From Finder/Time Machine/Backups/ it shows the 2 iMacs by name. Clicking on Time Machine in Applications will only show the iMac to which Time Machine is connected.

  7. #7


    Member Since
    Dec 29, 2010
    Posts
    61
    Specs:
    MacBook Pro 2.53 GHz Intel Core i5, 4 GB,1067, OSX 10.10.2 & iPad Mini 2 - 32 GB WiFi iOS 8.1.4
    I have several questions:
    I have a 500 GB can I use a 500 gb external drive w/time machine - is that "big" enough?
    If the worst happened and I lost everything, how do I get everything back from the external drive if my computer has crashed?

    Thanks for all the info.

    SweetPea

  8. #8


    Member Since
    Jan 22, 2010
    Location
    Victoria, BC
    Posts
    20,911
    Specs:
    Mid-2012 MBP (16GB, 1TB HD), Monoprice 24-inch second monitor, iPhone 5s 32GB, iPad Air 2 64GB
    Quote Originally Posted by SweetPea View Post
    I have several questions:
    I have a 500 GB can I use a 500 gb external drive w/time machine - is that "big" enough?
    Yes, but your "backup history" will not go "back in time" as far back as it would if you had a larger drive. I have a 500GB drive but only use about 400GB of it so my matching 500GB backup drive goes back only a few months.

    If the worst happened and I lost everything, how do I get everything back from the external drive if my computer has crashed?
    You first replace the crashed drive with a new drive. After that the answer differs depending on whether you were running Lion or not.

    For pre-Lion: you would boot the machine from the system DVD you got with your original purchase, re-install the OS. At some point it will ask if you want to do a restore from Time Machine. You do. That will restore everything exactly back to the place it was when the last TM backup was performed.

    For Lion: you start up the machine and wait for the Internet Recovery to appear. This will reinstall Lion via the internet. At some point it will ask if you want to do a restore from Time Machine. You do.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Time Machine not backing up
    By Trigger42 in forum OS X - Operating System
    Replies: 5
    Last Post: 09-21-2013, 01:31 PM
  2. Time Machine and backing up
    By Barders in forum Switcher Hangout
    Replies: 10
    Last Post: 01-22-2013, 11:47 AM
  3. Time Machine backing up 70GB every time even with no changes??
    By dennyc123 in forum OS X - Operating System
    Replies: 8
    Last Post: 10-09-2012, 08:13 AM
  4. Backing up on Time Machine
    By Jawad in forum OS X - Operating System
    Replies: 9
    Last Post: 08-08-2011, 06:06 PM
  5. Time machine not backing up Boot Camp partition to Time Capsule
    By DrDaveT in forum Internet, Networking, and Wireless
    Replies: 1
    Last Post: 12-22-2010, 03:20 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •