Aweber and GetResponse. Technically you can make any email autoresponder service work, but you'd have to be strategic about it if you are doing Affiliate Marketing. I've heard so many unfortunate stories about other providers closing peoples accounts due to affiliate marketing. However, Aweber and GetResponse have been more supportive of affiliate marketing and are currently the safest choice if this is what you want to do.
Bluehost backs up your site on their cheapest plan. With their Choice Plus plan, you get CodeGuard included for free, which is a more customized, advanced backup tool. There are also plenty of other backup plugins you can use for websites like UpDraftPlus, VaultPress, and BackupBuddy. In the end, CodeGuard is not worth increasing your monthly cost and you can find better alternatives. How to Start a Web Hosting Company (Easy Passive Income!)