Previously, I have been scrupulous in keeping the backup (.SQB) files that I use to mount Virtual Restore databases.
I understood thatt he data was read out of this, and stub vlf, vmdf files used to make SQL Server recognise the database.
Today, however, I had a bunch of DBs to restore, and mistakenly deleted a backup file from a mounted VR database. Nothing untoward happened, and the DB continues to function as before.
I thought the Hyperbac engine kept the backup files locked?