What up, I just purchased a new PC and I would like to know if I upload all my music and pictures on the PC, will I be able to transfer all info to an external hard drive if I purchase one months down the road? Appreciate the help and Happy Holidays to all!

Do you mean upload them to online storage? Yes, regardless of where you transfer them to in the meantime, as long as you have access to them, you can easily transfer them to an external drive in the future. There shouldn't be any problems there.
Take care.

Yes you can certainly do that.