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I think any notion of "if you could go back in time" automatically throws out the notion that time is linear - if it is linear, you could NOT go back.
That said, I think time is in fact NOT linear. If it is a dimension, it is of a higher magnitude that the 3rd. You can only percieve your dimension and those of lower magnitudes. Thus, we cannot properly percieve time. But, if it is a higher dimension (I think Einstein said 6th but I could be wrong), then it would have Length, Width, and Height, as well as a few other physical properties. As well, the fact that gravity warps time further supports the notion that time is more than linear.
However, I again reiterate that I percieve time as linear, regardless of the realities of its existence.
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