DVCS stands for distributed version control system, it has nothing to do with source code?
Maybe you're confusing it with SCM which are source control managers, that's the only ones that handle strict source only, but scm can mean other things.
Hard to say.. For me DVCS is more advanced version of DVFS. DVCS can do branching and merging, provides more metadata for revisions etc.. DVFS just do pretty much one thing, store binary blobs. And because binary blobs cannot be easly merged, I would not use it for storage here. But I guess, its just me :)
What is this dvfs you talk about? desktop virtual file system? Dynamic voltage and frequency scaling? Google doesn't know, or well, the first page doesnt know.
DVCS stands for distributed version control system, it has nothing to do with binary blobs, whether or not it supports it, is an implementation detail.
Maybe you're confusing it with SCM which are source control managers, that's the only ones that handle strict source only, but scm can mean other things.