The phrase "acted as a backdrop" is correct and usable in written English.
It can be used to describe something that serves as a background or context for an event, situation, or action.
Example: "The stunning mountains acted as a backdrop for the wedding ceremony, creating a picturesque setting."
Alternatives: "served as a background" or "functioned as a setting".
It acts as a backdrop for the sculptures she displays from renowned artists.
The fishpond (no longer stocked) acts as a backdrop for wedding photos.
A simple brick or painted wall can act as a backdrop for shadows to play upon, and the leafier the plant you set against it the better.
The lush dream pop simply acts as a backdrop to the story, and it is the perfect accompaniment to Atwood's tale, especially the flashbacks and dream sequences".
A herd of about 14 were brought to the island in 1924 to act as a backdrop to a silent film.
Aside from Kanahele, the primary cast is entirely white; the issue of Hawaiian independence and the lives of Hawaiian locals act as a backdrop for Bradley Cooper's military mission and love triangle.
Indeed, in this study, elevated rates of death with severe organ dysfunction were noted which appeared to act as a backdrop to the very high rates of death by overdose generally reported in such cohorts (see Web appendix 6 of this citation).
I awoke the next morning to a duvet of fog that acted as a perfect matt backdrop to the vibrant colours of the leaves, before Greg, who is a Justice of the Peace, dished up French toast and bacon then hurried off to marry a gay couple from Texas.
The building was originally to be clad in a shimmering sheath of silver glass, to act as a mirrored backdrop to the reddish Moscow City Hall.
For an artist with a confessed fear of blank spaces, whose paintings typically act as a vibrant backdrop to her complex installations, this "Solo Pintura" (meaning "only paintings") show is something of a rarity.
