I found a great article written by Chris Wahl about backing up your Synology NAS to Amazon AWS Glacier. Don’t you want to backup your home backup? What if your entire NAS burnt?
Amazon Glacier is really really cheap. It’s only 1 cent (US) per GB per month. So if you have 100GB on your NAS for backup offsite, it’s like a buck a month, plus transfer cost (a few more cents). It’s definitely cost effective than those consumer grade Google Drive, Dropbox, etc. And the best thing I haven’t mentioned is, there is an official Synology app for Amazon Glacier backup!
Here’s a detailed look at how to configure Glacier backups using a Synology NAS box with Identity and Access Management (IAM).