The photo of the support suggests that this is an unacceptable support. However, it would be helpful if you could take a picture showing the entire support from the base of the footing to the top of the beam.
You showed what looks like a main beam, but without a floor plan it is not possible to know how much load it is carrying. In general terms, an adequate support for a main beam requires a footing of adequate size, usually a cast in place concrete pad. Typically there would be a concrete post that is cast with the pad, normally reinforced with steel, and a connection bracket at the top. Simpson makes an entire line of galvanized steel brackets specifically to connect a beam to a concrete post (the bracket is embedded into the post during the casting process).
An alternative approach is to use a wooden post, connected to the footer using a bracket, and connected to the beam using a bracket. In your case, that may be a simpler approach than casting a new post. In either case, you must install an adequately sized footer, unless by some miracle you have one already in place, but judging from that photo, there is a high probability that the entire support is junk. It may not be necessary to remove the footer, you could cast another one near it, if the change in effective span of the beam does not cause the maximum moment on the beam to exceed allowable limits. If you use a wooden post, it must be PT, and make sure you use a standoff bracket, the post should not contact either soil or concrete, unless it is ground contact rated.
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