Unerasable in a sentence as an adjective

It made handing work in easier, but it also made an unerasable copy of the original record.

I'm happy to go on record here and the unerasable archives of internet history, risking my own reputation and that of my entire line of descendants, in saying that I am convinced this particular dog and pony show is a hoax.

Unerasable definitions

adjective

cannot be removed or erased; "an indelible stain"; "indelible memories"

See also: indelible