Worried about my blog

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Does anyone here have blogs? I'm really worry about my blog since anytime it will deleted. I've read other blogger member's complains that some of their blogs were deleted by blogger without any concrete reason. After reviewing the TOS, they aren't even violating it. I've also found a solution, exporting my blog daily. However, after another blog hop, I found out that it isn't enough too, since importing blog posts will not be able to restore pictures and videos and I've tested it myself yesterday. I'm really stressed about this, can anyone advise me how to back-up my blog without sacrificing other contents treasured? It's really an achievement to have 700 plus posts and yet it will just be gone in a blink of an eye, that's very disastrous. Does buying a domain really helps? Please please I really need help.