I realize that there are similar questions, but my question is slightly different: I\'m wondering whether sharing a bare repository via a synchronized Dropbox folde
One problem with DropBox has to do with how they handle historical backups. While you can roll back an individual file (within the last 30 days, or forever if you have PackRat), you cannot roll back entire directories. This means that if your repo gets screwed up for any reason, the amazing service of having a historical backup is essentially useless, since you would have to click on thousands of files to bring them back to an earlier version.
And then there are the problems with race conditions, if you will, mentioned by most of the other answers.