3, Final option and most recommended is to backup the whole system using the Time machine or Carbon copy clone .It will create a recovery partition also during the backup process. In the event of system crash. you can re-install the OS and backup all the content and your system will be up and running in few hours with all your old contents.
To Install OS and Backup
Hold down the

command + R button until it brings up the Utilities. you can then choose from
1 disk utility to repair HDD
2 Erase and reinstall the fresh copy of OSX and
3 Restore mac from backup