I have used DropBox over the past few years to carry out my projects, and I have never had any problems with it. Heck, if you also need an SVN repository, you can configure TortoiseSVN, and use Dropbox as a repository . Of course, they only give you 2 GB of storage for free (which can be increased through referrals). I have about 16 websites and projects there, as well as other documents, and I do not use 10% of what I have (about 3.2 GB).
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