PostgreSQL has pg_dump and pg_dumpall commands for this purpose, and MySQL has mysqlhotcopy, in both cases these are cross-platform as they will run on whatever you are running your database on.

PostgreSQL Manual - Chapter 22 - Backup and Restore
MySQL Reference Manual - Section 8.9 - The mysqlhotcopy Database Backup Program
We're not surrounded, we're in a target-rich environment!

In reply to Re: Backing up MySQL and PostgreSQL by jasonk
in thread Backing up MySQL and PostgreSQL by ghenry

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