I have had questions about stand alone  Backup Power Supply For Home to power a few lights and the tv.

Not everybody can afford all the bells and whistles

Where to start and what should one lookout for

eg

 

Lithium444 Power Pack By Flexopower on Takealot

Just search for FlexoPower on the forum. We have a few discussions on those a few weeks back.
If you just want backup they are a easy option and can power quite a few devices. They recharge slowly compared to other options, but they are lithium so the batteries will last longer.

ArtSolar now also have a few interesting kits which include everything you need and recharge with a solar panel. The cheaper options like this one is using lead acid batteries, but those Victron equipment (the blue items) can all handle Lithium batteries, so it is a easy upgrade in future.