They're completely different tools with different benefits, and both can be used together. VCS remembers only what you commit and push, per-project. Dropbox rem

They're completely different tools with different benefits, and both can be used together. VCS remembers only what you commit and push, per-project. Dropbox remembers your entire workspace as a whole, automatically. It remembers every time you save any file (more detail than you usually need, but can be handy in an emergency). It also remembers which projects you have on the go, and how they're organised. It remembers all the unpushed stuff within each project, including uncommitted changes, stashed changes, experimental branches, gitignored notes and ideas, even the knowledge of which branch you are currently on. Your entire workspace. And by 'remembers', I mean it automatically syncs all that stuff to all your devices, so your workspace is always exactly as you left it, whichever device you're now using.