So you have a Mac which boots up to a desktop as normal, but without your recovered data. This is not quite ideal, and gives us a few things to sort out before the migration. If you’ve not yet had your data recovered, check our Mac Data Recovery Services.
You will first have to backup any newly created data. If something goes wrong with migration then you don’t want to lose your new data. If this new system has been created with the same username as the old one, you will not be able to import the old user without renaming which is not advised. After you have backed up your files, you could open “System Preferences / Users & Groups,” (“Accounts” in pre Lion systems) and rename the current user to something else. This will allow you to transfer your original user account and Applications into the correct locations on the new system. If your system is set to automatically login to a user account (ie. doesn’t require a password when you boot) then you will need to turn off “Automatic Login” setting under Users & Groups to allow you to access the old user account.
Fingers crossed you should be ready to migrate.
Connect the new hard drive to your Mac. If it’s a desktop 3.5” drive then plug in the power adapter and switch it on. If you are restoring to a laptop then it would be a good idea to have the AC adapter plugged in, as this can take a while.
Go to “Applications / Utilities” and launch “Migration Assistant”. Choose “From another Mac, PC, Time Machine Backup or other disk.” Then choose the second option; “From Time Machine Backup or other disk.” You should see the orange icon for the external drive, labelled with your job number. Click on it and then click continue.
You can choose to migrate everything, or be a bit selective. You cannot choose individual files to migrate, only whole user accounts, Applications, Settings, and other files. Make your choice and click next.
The migration itself can take a while depending how much data you have. Once complete you can boot into the Mac and it will feel very familiar. As if nothing ever failed. If you backed up any files from the new system then now would be a good time to load them back on.
Migration Assistant generally does a good job of transferring your data and software. If any software installs files into the Mac system in unusual locations it may need to be reinstalled, but most Applications like Microsoft Office and Adobe Photoshop will be transferred correctly.