Backup of postgresql database with batch

Hi,

I want to create a batch file that backup our postgresql database schema. But I also want it to look in the backup folder how many files there are. If there are already 4 backup files, I want the batch file to delete 1. So the maximum of backup files has to be 4.

Below you find the code that I already have. I works, but I want to add that there can only be a maximum of 4 backupfiles.

 @echo off
   for /f "tokens=1-4 delims=/ " %%i in ("%date%") do (
     set dow=%%i
     set month=%%j
     set day=%%k
     set year=%%l
   )
   set datestr=%month%_%day%_%year%
   echo datestr is %datestr%
    
   set BACKUP_FILE=C:\postgresql_backup\backup_archx_%datestr%.backup
   echo backup file name is %BACKUP_FILE%
   SET PGPASSWORD=P0stgr3s
   echo on
   postgres\bin\pg_dump -i -h localhost -p 5432 -U postgres -F c -v -f %BACKUP_FILE% -n archx archx

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