Even if you use Time Machine to back up your files on Mac, it is a good practice to make an extra effort to save another copy of your important data in an external hard drive. The pictures you imported to the iPhoto from different digital devices must be very close to your heart. So whenever the Mac system or iPhoto application crashes there is a danger that you can lose all you lovely photos. If there is a system error then the time machine will not work and also it can give error at the time of back up. So it is better to move iPhoto library to external hard drive or another storage media.
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