Power backup question

[Bob Smith]

I apologize for re-asking this question, since many of you answered it a
few weeks ago.  I didn't hang on to what was sent around, and now I know
that I should have.  :-)

Does anyone have a recommendation for a good power backup system for PC
sized needs?  Do you have any recommendations against a system?  And are
there maintenace things I should know, such as battery checks?

Thanks,

-Bob Smith