My 14 year old has a 13 inch MacBook Air (early 2015) and is having storage issues. He is running MacOS Sierra. The Mac has 121 gb of storage, but the "system" category is taking up 102 gb. He and I have googled to try and find a solution but we have had no success. I am turning to SOSH for help with any suggestions to help him open up some storage or for a work around to help him have more storage. Thanks in advance.