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Running out of hard disk space on your Mac or Windows PC? If you have (or have had) multiple iPhones, iPod touches or iPads, there’s a very good chance old, unused backup files you no longer need are wasting a significant chunk of otherwise useful space — here’s how to get those gigabytes back.

According to Apple Knowledge Base Article HT1766, when you want to delete a backup created by iTunes (7.5 or later):

• Open iTunes Preferences:
— Mac: Choose iTunes > Preferences
— Windows: Choose Edit > Preferences

• Click Devices (iPhone, iPod touch or iPad does not need to be connected)

• Confirm that you want to remove the selected backup by clicking Delete Backup

• Click OK to close the iTunes Preferences Window

Also, in iTunes 8.1 or later you can view the phone number, IMEI and serial number of a backed up iPhone by hovering the mouse cursor over a listing (see above image), which is a handy way to locate the backup of the specific idevice you want to delete.

via @danielpunkass