archival

Of or pertaining to an archive or archiving.

In archival photographs, these lost structures appear almost futuristic (even today) in the way they carried trains across deep ravines on slender, balanced combinations of wrought and cast iron.

Of a material: having a quality suited to the conservational needs of archiving.

archival boxes    archival paper

The practice of storing items in an archive; archiving; (countable) an instance of this.

Our nightly computer backups include the archival of old e-mail messages.