Saving your blobs has nothing to do with the current firmware you are on (aside from special cases, but that need not apply to this situation). It only relies on the firmwares Apple is currently signing.
6.1 is no longer being signed, so you cannot save blobs for that firmware (or any firmware below 6.1.2 for that matter).
You may save your blobs for 6.1.2, regardless of being on 6.1.0, as Apple is signing it.
Unless you have an iPhone 3GS or iPhone 4, you can't downgrade using blobs at the moment, but it's still a wise idea to save them.