Postgresql中數據庫的備份有多種形式：
1、利用圖形化界面進行備份
2、利用命令進行備份
利用圖形化界面備份簡單易操作，但不穩定。可以利用命令進行備份.
Examples
To dump a database called mydb into a SQL-script file:
$pg_dump mydb > db.sql
To reload such a script into a (freshly created) database named newdb:
$psql -d newdb -f db.sql
To dump a database into a custom-format archive file:
$pg_dump -Fc mydb > db.dump
To reload an archive file into a (freshly created) database named newdb:
$pg_restore -d newdb db.dump
To dump a single table named mytab:
$pg_dump -t mytab mydb > db.sql
To dump all tables whose names start with emp in the detroit schema, except for the table named employee_log:
$pg_dump -t 'detroit.emp*' -T detroit.employee_log mydb > db.sql
To dump all schemas whose names start with east or west and end in gsm, excluding any schemas whose names contain the word test:
$pg_dump -n 'east*gsm' -n 'west*gsm' -N '*test*' mydb > db.sql
The same, using regular expression notation to consolidate the switches:
$pg_dump -n '(east|west)*gsm' -N '*test*' mydb > db.sql
To dump all database objects except for tables whose names begin with ts_:
$pg_dump -T 'ts_*' mydb > db.sql
To specify an upper-case or mixed-case name in -t and related switches, you need to double-quote the name; else it will be folded to lower case (see Patterns). But double quotes are special to the shell, so in turn they must be quoted. Thus, to dump a single table with a mixed-case name, you need something like
$pg_dump -t '"MixedCaseName"' mydb > mytab.sql
以上命令在執行的過程中需要加上常用連接數據庫的命令
例如：利用自定義格式進行備份
pg_dump -h localhost -U wyh -d -Fc databasename >d:/databasename.dump