question: public boolean makeBackupFile ( String directory , File file ) { if ( file == null ) { log . info ( "No file to backup" ) ; } else if ( file . canWrite ( ) ) { String backupFullName = directory + File . separator + createFileNameWithDate ( file . getName ( ) ) ; if ( log . isDebugEnabled ( ) ) { log . debug ( "new backup file: " + backupFullName ) ; } File backupFile = findFile ( backupFullName ) ; if ( backupFile != null ) { if ( backupFile . delete ( ) ) { if ( log . isDebugEnabled ( ) ) { log . debug ( "deleted backup file " + backupFullName ) ; } } } else { backupFile = new File ( backupFullName ) ; } File parentDir = backupFile . getParentFile ( ) ; if ( ! parentDir . exists ( ) ) { if ( log . isDebugEnabled ( ) ) { log . debug ( "creating backup directory: " + parentDir . getName ( ) ) ; } if ( ! parentDir . mkdirs ( ) ) { log . error ( "backup directory not created" ) ; return false ; } } if ( file . renameTo ( new File ( backupFullName ) ) ) { if ( log . isDebugEnabled ( ) ) { log . debug ( "created new backup file " + backupFullName ) ; } } else { if ( log . isDebugEnabled ( ) ) { log . debug ( "could not create backup file " + backupFullName ) ; } return false ; } } return true ; }
target:  Move original file to backup directory.