I certainly agree with the OP that film is much easier to archive than digital images. We should not forget, though, how many films have been lost in the past due to poor quality PVC film sleeves, or bad processing (bad washing for instance), or lost in the mail while shipped. The few rolls of Kodachrome I shot were a torture as I had to wait weeks to have them back. Never more.
Films still are at risk if people keeps them in the basement, or doesn't check health from time to time. Keep them high and dry!
Regarding backups, like athiril I do mistrust RAID solutions. There is an entire additional level of failure (RAID controller, that's supposing it is a hardware RAID solution) and when it fails it brings down the entire barn. I personally have a simple backup strategy: One relatively new disk inside the PC; one relatively new external disk as backup; most of what I do I send to stock agencies so I consider them by "external" backup.
Hard drives with important information are to be treated like the "distribution belt" of your engine (what's in English? The things that brings motion from the piston shaft to the cam shaft). It will fail and it will be tragic. Substitution must be planned before failure. The "old" disks can be used for less important information (such as the operating system. When the disk fails you know it immediately and you restore your system backup to a new disk without crying).