Can I get a recommandation for an I.T. support service in the Roseville CA area?

Woo that's my old stomping grounds sorta when I was living in California.  I used to work for Excel Computers off of Freeport in South Sacramento.  I didn't know of any specific ones in Roseville.  But this was 20+ years ago.  So I really can't necessarily weigh in on that for you currently.  

I do know Excel Computers used to be really good.  But I again haven't worked for them in years.  I know the owner passed a way some years ago and the Lead Technician stepped up and started running things.  He's a very good technician.  I am not sure how he is at everything else.  To be honest he wasn't the most friendliest.  But he certainly knew his stuff.

Good luck.  Please do not grade this as an answer.  My information is over 20 years old.  I just was excited to see Roseville! :)

Some thoughts however though, what kind of Technical Support do you need?  Do you require onsite service?  PC Desktop/Laptop or Mac service?  Tablets?  Audio/Visual?  Phone Systems/Voip/smartphones?  And about how many users?
Might help with getting an idea of if the Tech Support outfit you choose can support everything you need.

Small office
One Server 2012 running terminal services to 4 Window 10 PCs with 3 network print/scan units. Users are on QuickBooks all day along with some other Intuit products. The owner is my brother I would support them but I'm not experienced in terminal service setup like this.

You might be lucky and find a consultant with a website.
Ask businesses around you.

I do this work now including Windows, Networking, WAN, VPN and Quick Books support. There is lots of work here as well. Different country than you.

a good, trustworthy independent guy

To this point that Lee made.

I have run my own business successfully for over 15 years. I know have had a colleague (his own business) for near ten year and we work together on some things.

We work hard, we are honest, we are problem solvers, we are technically good and neither of us has lost a client (we have had small one-of clients), and clients are loathe to let us go (retire). I am long past normal retirement age.

If you are open to remote support, there are many resources available such as right here on EE CLICK HERE

There is also Upwork which was formerly ODesk and Elance, and have since been merged into one company.

If you cannot find local techs, are open to being the hands and eyes for remote technicians, this may be a solution to your needs.

HTH

he is looking for a local company

Then he should probably talk to local people.  I mean fellow business owners - "Hey Joe's Insurance, who do you use for IT?  Are you happy with them?" "Hey Betsy's Floral Arrangements, who's your IT support?  Are they any good?"

Agreed with Lee W.  Check local business associations in conjunction with other small businesses in the area.