Problems with importing and restoring snapshot

On source site there was problem with creating whole snapshot of files and database. It failed. So it was split to files and database separately. Snapshot were created.
However on new site only snapshot with files was restored successfully. One with database failed.
During chat session we tried to import it on another site but it failed, throwing error

Error: Manifest data not found in archive.

it suggest that snapshot file was corrupted while creating.