Backups are good for certain limited chores such as backing up your version control system! :) But ONLY if you have a mechanism to verify the sanity of your previous backup and the original before making the next backup. Else, you are back to backing up corrupted data.
A good version control system protects you from corruption and accidental deletion since you can always go to an older version. And the backup system with checksums (often built into VCS) should protect the version control system.
If you don't have space for VCing your data you don't likely really have space for backing it up either, so do not accept this as an excuse to not vcs your data instead of backing it up.
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