If you are an expert user and don't mind the technical complexities (keys, buckets, etc.) and the complicated (close to unpredictable for most) pricing scheme, Glacier will work.

deepfreeze.io makes it much easier, and offers integrations with other services too (currently only Dropbox, more soon), that allow you to transfer files between deepfreeze.io and these services on the server side -great if you don't want to re-upload 50 or 100GB, you already have in Dropbox, over your home Internet connection.

Disclaimer: I'm the founder of deepfreeze.io.