We partnered with CloudAlly, following research into the available options for Salesforce Backup at a price our non-profit customers could afford. The output from that research can be found here. The short version is that we found CloudAlly to be investing substantially in their Backup solution, offering more and more functionality that you might expect to find in a more expensive platform. They also offer a good non-profit discount! Do please get in touch if you would like us to arrange and configure backup for your Salesforce environment.