"I justt don't see the need to use an outside storage."
Well whether you know it or not, hard drives (including and especially SSD's) has a predetermined write access limit that when reached, will prevent the drive from writing any new data to it. In most situations (fairly common), the data on the drive can still be retrieved, but a new/other HD will be needed to move and keep the data. So, since no hard drive lasts forever there are a number of companies that now offer Cloud Storage which is basically online storage space that is backed up for you and guaranteed to not be damaged or lost, FOREVER. Google has Google Drive, Microsoft has Skydrive/One Drive, Dropbox, which is it's own company (I think may offer 50GB of Free Storage).
These services, when setup and installed will automatically backup predefined files and folders on your computer, phone, tablet or other device and safely and securely allow you to access those same files from anywhere in the world with the proper permissions and/or 'Link'/'URL'/'Website Address'.
@reli37, hopefully this little explanation will show you a possible 'NEED' to use an outside "Cloud Storage" account so as not to ever lose or misplace your personal files. Music, Movies, Photo's, Software... All can be saved and accessed anywhere you have access to the internet, as long as you remember how to access your specific account.
Google is HIGHLY recommended by myself and more than a million others. Uploaded pictures and files to Facebook will also never be deleted unless you do so, yourself.