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I believe if you have saved messages it will tell you after so many days it will delete a saved message(I believe 30 days). All you need to do is listen to it and save it again. If you have VVM you can export the voicemail if you wish to.
They don't have disk backups like you think they do.
tidbits has a great suggestion to hold on to messages past the deletion date. Sorry if you weren't informed of this before, but we don't keep the message in the system for an unlimited amount of time, but there are ways to keep them longer.