I needed a basic script to do basic backup of a set of databases on a mongodb on Windows.

backup_mongo.bat

REM | Hobo simple backup scripts for MongoDB
REM | Hastily constructed by Adam Phillabaum <adamp@payscale.com>
REM | Starting point was here: http://stackoverflow.com/a/5497138/240539
REM | 
REM | Dumps all databases from a mongo server, then copies them to a network share.
REM | It just deletes old backups without any safety checks. Not safe.

REM CONFIG SETTINGS
SET host=mongoserver:27017
SET mongoBin=.
SET backupsFolder=\\networkshare\mongobackup
SET tempFolder=c:\temp\mongobackup

REM RUN THE DUMP
if not exist %tempFolder% md %tempFolder%
%mongoBin%\mongodump.exe --host %host% --out %tempFolder%

REM MOVE TO CENTAL SERVER
SET datestamp=%date:~12,2%%date:~4,2%%date:~7,2%
if not exist %backupsFolder%\%datestamp% md %backupsFolder%\%datestamp%
xcopy /e %tempFolder% %backupsFolder%\%datestamp%

REM CLEANUP
rmdir /s /q %tempFolder%
net use p: %backupsFolder%
forfiles /p p:\ /d -45 /c "cmd /c rmdir /S /Q @path"
net use p: /delete