draw another sprite or flip it?

Say you have a character who you have running back and forth for a side scroller, should you draw another sprite for running backwards? or do you just use the same one for running forward but flip it over? Just curious of your opinion.
Flip if you are lazy/don't want to pay your artist to make another sprite for the other direction/want to save space. Otherwise feel free to make opposite-facing running/other action sprites. Just don't copy the one direction, flip it, and add those files as opposite-facing sprites as that just wastes space.
I'm sorry but I do not understand that last sentence, I'm doing the art myself so it's no matter of paying an artist. So do I draw another? or do I copy the one I have and flip it horizontally and add it to my sprite sheet that way?
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