A quick method via batch file to backup your valuable source files only, from a gradle project. Paste it to a batch file inside your project folder and execute it, the archive will created (excluding the unwanted files) one dir back.
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@echo off
REM get current folder name
for %%a in (.) do set currentfolder=%%~na
REM echo %currentfolder%
REM maybe here need an adjustment due your system locale settings
set YYYYMMDD=%DATE:~10,4%%DATE:~7,2%%DATE:~4,2%_%time:~0,2%%time:~3,2%%time:~6,2%
cd /d %ProgramFiles(x86)%\WinRAR\
rar.exe a -ep1 -r "%~dp0..\%currentfolder%%YYYYMMDD%" -x*.jar -x*.aar -x*\build -x*\.gradle -x*\.idea "%~dp0"
pause
origin - http://www.pipiscrew.com/?p=11580 backup-only-the-source-files-from-an-android-studio-project