Can you list the main types of data backup in PostgreSQL?

Main types of data backup in PostgreSQL:

1. Physical Backup — copying database files at the file system level. Usually done using tools like pg_basebackup.

2. Logical Backup — exporting data and schema as SQL scripts using pg_dump or pg_dumpall. Allows restoring data on another server or version.

3. Replication and WAL Archiving — continuous saving of changes through Write-Ahead Logging (WAL). Enables Point-In-Time Recovery.

4. Snapshots — using file system or virtualization capabilities to create instant data snapshots.

Each method has its advantages and is used depending on recovery requirements and infrastructure.