to answer
A person who has an idea or know much on each field can maintain his/her own server alone. Well not unless you specify time on when those jobs need to be done. Since you didn't specify, I'll stick to my answer that yes! Me, you, him, and/or her can do those alone.
Take time in short
yeah you were right simply "YES". and to the rest thank you for the comment anyway.
thanks for correcting me
for new commers, just take it easy