A remote personal file server is the way to go.
Shirley you lot have remote ("off campus") personal file servers? Why trust other people for remote data storage when you can park an old Pentium box of arbitrary capacity and encryption of choice on your Great Aunt Ruth's DSL line in Duluth?[0] Has worked for me since DSL became available in Duluth ...
Offer to pay for her DSL (she'll probably decline), and promise to only use the bandwidth once per day in the wee hours Duluth time so you don't interrupt her viewing of cute cat videos. Offer to similarly backup her data (and cute cat pics) onto your home equipment. Automating both to happen at 3AM Duluth time should be trivial. Use the encryption method of your choice.
You can invite other friends relatives into your "circle of archive protection". Once you've got yours and the Great Aunt's automated, adding a few more archive sites is trivial, as is adding redundant backup sites. The first time it's needed, by any any one of them, for any reason, the minimal effort will have been worth it. (For example, a friend who lost everything in the Tubbs fire a couple years ago still has copies of all his important documents, email, personal pictures and home videos. Priceless, that.)
[0] Insert other favorite elderly relative+city+connection method to meet your needs. An old, low power draw, headless laptop is ideal for this kind of thing. I run a very minimalistic BSD on mine, YMMV.