"permanently preserved" is a perfectly correct and usable phrase in written English.
You can use it to describe something that has been safeguarded or secured for a long period of time, usually with the intent of preserving it in its current state. For example: "The ancient ruins were permanently preserved with a protective coating to prevent further damage."
Can the Webcam actually make every live performance a widely shared, even permanently preserved, event?
Lucasfilm said about 5,000 acres were permanently preserved with an 11-mile hiking trail.
His teenage self has been permanently preserved in a 1983 Life magazine portrait of the young gaming scene's most accomplished players.
It contains the only permanently preserved voices of firefighters from the tower stairwells, including transmissions from the fire chief who climbed highest into the building.
Over the years, the state has permanently preserved 922,000 acres from development out of a total of 4.8 million acres of land in New Jersey.
Local attractions include the Valley Gardens and the extensive common, called the Stray, permanently preserved from development by act of Parliament.
The polymer hardens after the application of a catalyst, permanently preserving the deceased entity.
The committee works to preserve farms by buying some that are on the market and reselling them with a deed permanently preserving the land for agriculture.
Summary: Columbia University Libraries is working on a large-scale project, funded by the Ford Foundation grant, to permanently preserve and make accessible the archives of the International Fellowships Program.
In general, records cannot be deleted or destroyed without prior authority from the National Archives, which permanently preserves records judged to be of historical value.
"People recognize how important it is to be able to permanently preserve contiguous property to protect the water supply and wildlife management".
