SQLite database replication on the same server
Searching for the same topic, I came across a mention in Using SQLite: Small. Fast. Reliable. Choose Any Three.:


  Replication
  
  SQLite has no internal support for database replication or
  redundancy. Simple replication can be achieved by copying the database
  file, but this must be done when nothing is attempting to modify the
  database. Replication systems can be built on top of the basic
  database API, but such systems tend to be somewhat fragile. Overall,
  if you're looking for real-time replication — especially at a
  transaction-safe level — you'll need to look at a more complex RDBMS
  platform