Batch file anchored

You can use the pushd command to change the working directory , pass %~dp0 to indicate directory of the .bat file, see an example:

@echo off

echo Diretorio atual %cd%
echo Diretorio do script %~dp0

REM Altera o diretório atual de trabalho
pushd %~dp0

echo Diretorio atual %cd%
pause

When using pushd %~dp0 you indicate that the current directory is where the file is located.

Output:

Diretorio atual C:\Users\<usuario>
Diretorio do script C:\Users\<usuario>\local\do\batch\
Diretorio atual C:\Users\<usuario>\local\do\batch\

Pressione qualquer tecla para continuar. . .

The pendrive has to have some mark to be checked. Can it be like this: You create the \ subs folder on the pendrive you are going to use for backup and put the code below into the folder.

@echo off
if EXIST d:\subs\*.srt set PENDRIVE=D:&goto backup
if EXIST e:\subs\*.srt set PENDRIVE=E:&goto backup
if EXIST f:\subs\*.srt set PENDRIVE=F:&goto backup
if EXIST g:\subs\*.srt set PENDRIVE=G:&goto backup
rem Acrescente outros Drives se quiser
echo NENHUM PENDRIVE ENCONTRADO.
goto fim
:backup
move /y .\*.srt %PENDRIVE%\subs
:fim
pause