If you need to restore your Mac OS operating system, use the special Time Machine utility (it is already built into the system, you do not need to download and install it).
Instructions
Step 1
First of all, you will need the installation disc for your operating system. Insert it, and on the keyboard press the C key. After that, the computer should boot from the disk. Then select the installation language and wait until the main menu screen is displayed.
Step 2
Click on the Utilities column. In the dropdown menu, you will need the Restore System from Backup option. Click on it and a window titled Restore Your System will appear on the screen. After clicking the Continue button, the utility will search for Time Machine files. Select Backup and click on Continue again.
Step 3
Now decide on the date of the backup and the disk to which you need to restore data (as a rule, this is the main hard drive). The procedure can take from 15-20 minutes to an hour, or even several. Everything will depend on how much data needs to be restored (the more, the more time it will take for the procedure, respectively).
Step 4
The utility will calculate the required amount of time by itself and will report it. Immediately after that, you can proceed directly to the system recovery by clicking the Restore button. Please note: the program will display a warning about deleting all data from the disk on which the backup is installed. To go to the next step, click on the Continue button.
Step 5
Once the recovery process is complete, you will need to restart your computer. After turning on, the system will work in the same state.
