The answer, in a nutshell, is no.
I’ve written about this before… when Digital Railroad failed a couple years ago and gave photographers 24 hours to download their photos, it should have been a big wake up call for photographers that these services can’t be trusted as archives (at least, not without offline backups as well). Now, maybe they can’t even be trusted as temporary storage. With tech companies it’s all good… until it’s not. Then the CEO announces everyone is laid off and the servers are shut down. I’ve been part of startups where this has happened. As Jason Perlow points out in an excellent blog post ‘Flickr: Too big to fail?’, Flickr is not too big to fail.
AND even if it doesn’t fail, that doesn’t mean your account won’t be accidentally deleted and since Flickr doesn’t have backups of your data, there goes all your photos. Which means all the links on your blog or web site that point to Flickr (or Vimeo or…) get broken requiring a lot of time and aggravation fixing your site. Assuming you have all those photos backup in a single place and you don’t have to go rooting around for the particular photos/videos you uploaded… which would involve even more time.
I’ll point out that I think these sites are great usually. I use them, particularly vimeo. However, it’s important to know what will happen if things go wrong and to know what you’re in for.
Anyways, give Jason’s blog a read… it brings up some good questions and concerns.