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Enterprise Postgres 17 Installation and Setup Guide for Server

E.6 Estimating Backup Disk Space Requirements

This section provides the formula for estimating backup disk space requirements.

Backup disk space requirements = size of the database cluster x 2 + transaction log space requirements
                             + archive log space requirements

Note

If the pgx_dmpall command performs a backup using a user exit, the backup disk size differs according to the database resources targeted for backup and the copy method.