Let us forget the storage media and start think about the format. How many of today's popular formats will be here after 50 years ? May be none of today's formats will be there at that time. So if I some how preserve my documents in some storage media, which software will help me to open it ? How do I know MS office is there after 50 years. How can I trust the formats which are supported by a single company? So I too come to the same conclusion like the author of the specific tech article. Keep our important documents in different storage media in multiple formats. I should keep one copy of data in open standards. Open standards have a chance to survive more than the proprietary formats. Now what about the storage media ? Storing your documents in online storage can loose your physical touch with the files. In addition to this you need to blindly believe the company who provide this service. Though it is risky, right now we don't have much options left.