Hi, I am having the following problem. I bought a mac about a month ago, 250 GB hard drive. I have not downloaded any significant amount of software or videos as far as I can think of. However, this morning it said it had 3 GB left. This was hard to believe - I assume if Macs typically filled up after 1 month of use, no one would buy them. The messages are 1) Yellow "!" triangle: "Your disk is almost full; Save space by optimizing storage" (close / manage) 2) Dropbox symbol: "Your hard drive space is low; Dropbox can't sync until you free some disk space on your computer." Under apple icon > about this mac > storage, it says "898.5 MG available of 250.79 GB" ... "251 GB flash storage." Its specs according to "about this mac" are: MacBook Air, 13" 2017; Processor: 1.8 GHz Intel Core i5; Memory: 8 GB 1600 MHz DDR3; Startup Disk: Macintosh HD; Graphics: Intel HD Graphics 6000 1536 MB. When I click "manage", it shows the following disk usage stats: Applications: 6.53 GB Documents: 7.69 GB iBooks: 0 iCloud Drive: 204.66 GB iOS Files: 0 iTunes: 0 Mail: 0 Messages: 0 Music Creation: 2.55 GB Photos: 0 Other Users: 582 KB System: 22.71 GB It would seem that the problem is the iCloud Drive. So I click on it and "open iCloud preferences." This leads to a window that says "755.4 MB of 5 GB used." Below that, there is a bar that says "4.26 GB" and it is about 20% full. So ... which is it, is my iCloud Drive storing 4.26 GB or is it 204.66 GB? What is using up the 250 GB? Do I really have 250 GB or is it somehow much less? By the way, my dropbox account online says: "Using 6.53 GB of 1.01 TB" So, I can't figure out what is taking up all this space. Thanks for any help you can give.