Would not use a SSD persay.
Might take a look at this:http://www.sandisk.com/products/usb/memory-vault/
While that sounds promissing my take is if it is really that important, then:
.. Store on DVD/Bluray/M-disk and a copy onto a 2nd media source. and Verify both copies at least once per year.
.. For SSDs verify quarterly.
.. DVD/Blue ray, store sealed with a dessicant.
Also, what many seem to forget - You must still have a system to read what ever you use to store that data on, ie
will USB ports still exist, will SATA interface exist, may need to visit a musem to find a DVD drive in 20 years.