Create a test database, say "t2".
Run mariabackup --backup.
Drop database "t2"
Run mariabackup --incremental(-basedir)
Prepare and restore the backup.
See the dropped database restored. - All the objects in the database will be gone, but the database itself is still there.
- relates to
MDEV-28446 mariabackup prepare fails for incrementals if a new schema is created after full backup is taken