1. Mac Users: Download MacKeeper, its an amazing software, and while it cost 38.99 for one user (59.99 for two users and 89.99 for three) it's an incredible piece of software I use every now and then. You can find and delete duplicate files, see what software is taking the most space on your hard drive and best off, keep your Mac clean! It can delete junk (you review it first of course) and remove any virus you may have. Good for a novice at tormenting and are very, very scared of the deep down world of torrent and the *dom dom DOM* Pirate Bay!
Price:$38.95, 59.99, 88.99
2. External HDD: Yes yes I know that you know, but still, this is a great option. Buy one for about 70 bucks, back up the whole computer, and just delete all the stuff you don't really use by may need for one day. As long as you don't misplace the drive, you're all good incase you every need the data again! (Don't lost that wire either, sad story behind that one for me... ;( )
3. Cloud, cloud, cloud: Something else you know about. Data gets stored in a hard drive wirelessly (AKA, The cloud) and you can access the data from anywhere you with an internet connection. While this is usually expensive for large amounts of data, it may be a good option for students or workers who only need to save 5-50GB of data.
Price:Free-$100 (Dropbox, iCloud....)
If you would like me to give you tips on anything or have any questions what so ever on anything tech, drop me a comment below or shoot me an email at firstname.lastname@example.org