pg_dump  -F c -h 192.168.1.25 -w -U admin dbname > d:/dbname

#( db_test
#AsLoggedUser
Time: 0 23 * * * *
Action:
StartIn: "D:\bat" 
ShowNormal   NormalPriority
START-APP: D:\bat\db_test.bat
)#

#test.bat
set > d:\set.txt
c:
cd "C:\Program Files\PostgreSQL\9.1\bin"
psql -X  -U admin  -d postgres -w --set ON_ERROR_STOP=on -1 -c "drop database if exists  tmp"; || goto end; 
psql -X  -U admin  -d postgres -w --set ON_ERROR_STOP=on -1 -c "create database tmp" || goto end;
pg_dump -v -h 192.168.1.25 -w -U admin dbname > d:/dbname.backup || goto end;
:end

#crontab
#( test
Time: 36 13 * * * *
Action:
StartIn: "D:\bat" 
ShowNormal   NormalPriority
START-APP: D:\bat\test.bat
)#


#set.txt
ALLUSERSPROFILE=C:\Documents and Settings\All Users
CommonProgramFiles=C:\Program Files\Common Files
COMPUTERNAME=PROG
ComSpec=C:\WINDOWS\system32\cmd.exe
DXVCL=C:\Program Files\Developer Express Inc
FP_NO_HOST_CHECK=NO
GDAL_DATA=C:\Program Files\PostgreSQL\9.1\gdal-data
NUMBER_OF_PROCESSORS=2
OS=Windows_NT
Path=D:\bat;...тут много всего
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
PROCESSOR_ARCHITECTURE=x86
PROCESSOR_IDENTIFIER=x86 Family 6 Model 15 Stepping 13, GenuineIntel
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=0f0d
ProgramFiles=C:\Program Files
PROMPT=$P$G
SystemDrive=C:
SystemRoot=C:\WINDOWS
TEMP=C:\Temp
TMP=C:\Temp
USERPROFILE=C:\Documents and Settings\1
VBOX_INSTALL_PATH=C:\Program Files\Oracle\VirtualBox\
windir=C:\WINDOWS