Can i get a Back up for Comcast cable modem so that phone doesn't stop working during power outage

Hello vzab,

I was looking over your account and noted that your voice equipment does not have a battery installed. I can get a tech out to ensure that you have a proper battery installed to avoid this inconvenience in the future. Please send me a private message with your preferred contact information so  I can schedule the tech to your site.

Thank You

A battery is good but a backup is always a good idea.   I use a series of screenshots to back up my modem.  Just do Cntl-Alt-Printscreen and paste the clipboard into Paint then save as a png

In addition to all that, adding a UPS to supply AC power to all your communication gear is cheap compared to loss of business due to outage.