Long term? Not gonna happen.

No matter what, you will have to copy the data from media to media over time. I've got tapes in my desk that I don't have a drive for, and can't even remember what software was used for the backups. DVDs and CDs only last a certain number of years. Hard drives can always die, online services can go out of business, etc.

Best thing I'd do now would be use 2 separate USB hard drives both with all the same data on them, and realize I want to replace them every 3 years.