Time Machine vs Clone Backups
Contents
1. some of our files can t be found Perhaps the computer won t even boot up What are our options a Restore the entire internal hard disk from Time Machine or b Restore the entire internal hard disk from the SuperDuper clone Major advantages and disadvantages of each option are highlighted Note I m just going to outline the steps estimate the time involved and show what the results are References to instructions on how to do it are in Appendix II With either option first we check and or repair the the internal hard disk with Disk Utility to make sure it is functioning properly and our problems are not due to a hardware problem with the disk a Restore from Time Machine Boot up machine from OS X install disk The Time Machine backup is not bootable 5 to 10 min Choose Restore from Time Machine in the Install menu Choose the date and time in this case 5 3 to restore the internal hard disk to Before the problems started Wait until the restoration process is finished to use the computer again Several to many hours Result Computer Internal Hard Disk Time Machine Hard Disk File C 5 2 10 File C 5 2 10 P DeGroot p 4 of 7 5 26 10 A graphical illustration of the differences between a Time Machine Incremental backup and a SuperDuper Clone backup and recovery from some computer disasters b Restore from SuperDuper Clone Boot up machine from SuperDuper clone disk 1 2 min At this point you can actually2. apple com article html path Mac 10 5 en 8492 html Restore from Time Machine http docs info apple com article html path Mac 10 5 en 15638 html Restore from SuperDuper clone Download the SuperDuper User guide under Want more information on this page http Awww shirt pocket com superduper superduperdescription html Set up SuperDuper The User Guide see above Set up Time Machine http docs info apple com article html path Mac 10 5 en 11421 html P DeGroot p 7 of 7 5 26 10
3. disasters Appendix I Suggested Backup Disk Sizes First find out how much data you have on your internal hard disk Select it s icon on _ PBD Desktop HD Info your desktop right click and select Get Info PBD Desktop HD ims Modified May 18 2010 6 58 PM If you think you will eventually fill up most of your internal hard disk use this number minus 10 GB you never want to have less than 10 GB free on your internal drive or computer performance will suffer General If you don t think you will add much more than you already have on you internal hard disk use this number plus about 20 just to be safe Kind Volume Weated Tuesday May 18 2010 12 10 PM MoWified Tuesday May 18 2010 6 58 PM VerNon 10 6 3 Format Mac OS Extended Journaled Capacity 319 73 GB Available IZ U For Time Machine about 3 X whichever number you choose should give you at least 6 months of backups It does depend on how often you edit files too mabet x OB weBEs For SuperDuper or a similar clone type backup try to get close to the capacity O Shared folder number less 10 GB In this case for instance would use at the very least a 250 GB external disk or better a 500 GB disk partitioned into 2 Volumes one 320 GB for the clone and the remaining space as a separate volume for general data storage or some other purpose Appendix II Links to instructions Repair Check Internal Hard Disk http docs info
4. recovery from some computer disasters Computer Internal Hard Drive Time Machine Hard Drive SuperDuper Hard Drive File C 5 3 10 5 2 10 File C 5 2 10 deleted File C 5 2 10 P DeGroot p 2of 7 5 26 10 A graphical illustration of the differences between a Time Machine Incremental backup and a SuperDuper Clone backup and recovery from some computer disasters 5 519 Disaster Scenario 1 OOPS We shouldn t have deleted File C on 5 3 10 We need it What are our options for recovering it We can Enter Time Machine and recover either the 5 1 or 5 2 version of File C Computer Internal Hard Disk Time Machine Hard Disk File C 5 2 10 en File C _ 5 2 10 or we can go to the SuperDuper hard disk and copy File C to the Computer s internal hard disk but only the 5 1 version is available If we had made another clone backup after deleting File C then we would be completely out of luck SuperDuper Hard Disk Computer Internal Hard Disk P DeGroot p 3 of 7 5 26 10 A graphical illustration of the differences between a Time Machine Incremental backup and a SuperDuper Clone backup and recovery from some computer disasters eee er rece er cee eee eee reece eee eee eee eee eres ees eeeseeeeeeeseeeseseeeseeereeeseeeseeseeeeseeeeeeseeeeeee eee eee eee eee eee eee eee eee eee ee eee eee eee I Ii 5 5 10 Disaster Scenario 2 There appears to be a serious problem with OS X Applications are not running properly and
5. A graphical illustration of the differences between a Time Machine Incremental backup and a SuperDuper Clone backup and recovery from some computer disasters There are only two types of computer users those who have lost data and those who are going to lose data Finonymous For this illustration we are going to simplify things and assume we have only 3 files on our computer They can be documents applications emails system files or whatever Here is what our computer s internal hard disk looks like at the start We now connect two external Hard Disks aka Hard Drives The backup schedule for Time Machine is automatic as noted below and we set up SuperDuper to back up once a week For suggestions on what size external disk s to use see Appendix l The contents of the 3 hard disks are shown below as time goes by and we modify files Whenever we modify a file the date and shade of color will change If we delete a file it will go away We will assume we only edit a file once per day but in reality Time Machine keeps hourly backups for the first 24 hours daily backups for the next week then weekly backups until the external disk runs out of space Computer Internal Hard Drive Time Machine Hard Drive SuperDuper Hard Drive Date 5 1 10 5 2 10 e 5 2 10 File C 5 2 10 P DeGroot p 1of7 5 26 10 A graphical illustration of the differences between a Time Machine Incremental backup and a SuperDuper Clone backup and
6. root p 5 of 7 5 26 10 A graphical illustration of the differences between a Time Machine Incremental backup and a SuperDuper Clone backup and recovery from some computer disasters b Restore from SuperDuper Clone Boot up machine from SuperDuper clone disk 1 2 min At this point you can actually use your computer normally and wait to do the internal disk replacement and file restoration at a more convenient time if you wish Replace internal hard disk in the computer Days to Weeks Follow the instructions in the SuperDuper user manual to restore the internal hard disk Several to many hours Any changes to files made after the clone date will be lost Unless you also have a Time Machine backup from which you can recover these files In both options the contents of the hard disks at the end of the repair and restore processes would be the same as shown in Scenario 2 You are still going to be without your computer at some point for the length of time it takes to have the internal disk replaced f you have a spare computer note that booting up a second computer with the clone from a different machine generally does not work However you can use Migration Assistant and an existing Time Machine or SuperDuper backup to restore to a different computer P DeGroot p 6 of 7 5 26 10 A graphical illustration of the differences between a Time Machine Incremental backup and a SuperDuper Clone backup and recovery from some computer
7. use your computer normally and wait to do the internal disk file restoration at a more convenient time if you wish Follow the instructions in the SuperDuper user manual to restore the internal hard disk Several to many hours Any changes to files made after the clone date are lost Unless you also have a Time Machine backup from which you can recover these files Result Computer Internal Hard Disk SuperDuper Hard Disk 5 5 10 Disaster Scenario 3 The internal hard disk started making strange noises then died completely We tried to check and or repair the the internal hard disk but couldn t What are our options We need to replace the internal hard disk then a Restore the entire internal hard disk from Time Machine or b Restore the entire internal hard disk from the SuperDuper clone Major advantages and disadvantages of each option are highlighted Note As before I m just going to outline the steps estimate the time involved and show what the results are Details of how to do it are in Appendix II a Restore from Time Machine Replace internal hard disk in the computer Days to Weeks Boot up machine from OS X install disk The Time Machine backup is not bootable 5 to 10 min Choose Restore from Time Machine in the Install menu Choose the date and time to restore the internal hard disk to Before the problems started Wait until the restoration process several to many hours is finished to use the computer again P DeG
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