A good rule of thumb is any content on a "free" site (YouTube, Facebook, Vimeo, etc) can usually be pulled at any time and for any reason. And the small print typically also says they can re-purpose the content.
I have recommended Libsyn/Wizzard for storage and good stats but also look at domain hosting places such as Dreamhost.com who have unlimited bandwidth. You pay a small amount for unmetered bandwidth and a secure server and never have to worry about anything.
Frank
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