I have 24GB of memory installed on my 2014 iMac Retina. I noticed lately that my memory usage has gone up substantially. I opened up Activity Monitor and saw that OneDrive is the cause. I closed the app, removed and re-installed it and monitored it for a day. It gradually takes up most of my memory. Attached screenshot for reference. Any ideas on why this might be happening? Maybe its the latest Yosemite update that is causing it? I'm not sure.