I have to spend the whole Saturday night just to clear up my two external drives and my two hard drives in my computer. It is a chore doing them because the transfer of the files from drives to drives take a long time.
That's why I like to store most of my photos online because I can safely delete some files when they are taking up too much space. My bad habit is to store my files into several hard drives in my computer. Then, when I am in the mood, I will delete and trim. However, at times, I accidentally deleted all the back-ups. So, always keep online storage for your important files if you cannot afford to lose them.