It's better to encrypt your single wallet to prevent anyone from using it if he gets his hands on it, and than backup it in several places, including the cloud. My preferred backup is to email it to myself. Google will keep it safe forever, and it's easy to periodically email it again if you exceed the limit of unused keys, which will force the wallet to generate the new keys.
This post gave me cancer.
Please just start using Armory. It's better in every way than what you're doing.
Armory sucks for me. Upgrading it erased my Bitcoin Core installation. The bootstrap still doesn't work after several tries. Now I have a week long download ahead of me. I will wait until there is a lite version.