Google Scripts Editor - 覆盖备份文件

Question

I am working with Google Scripts Editor. The purpose of my script is to backup a spreadsheet from Google Sheets to my local as a csv. I would like each new backup to overwrite the previous backup file. Currently the script results in subsequent backup files as the same name but as a copy (Ex. filename (1).csv and filename (2).csv) Any help in overwriting would be appreciated.

  function myFunction() {// UPDATE THE FOLDER ID for e.g. "My Drive > Docs > Backups"
  var backupFolder = DriveApp.getFolderById("foldername");
  var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  var spreadsheetId = spreadsheet.getId();
  var file = Drive.Files.get(spreadsheetId);
  var url = file.exportLinks[MimeType.CSV];

  // UPDATE THE SHEET-NAME TO BE EXPORTED - e.g. sheetName = "Malawi Ops"
  // -- LEAVE IT BLANK TO EXPORT THE ENTIRE SPREADSHEET - i.e. sheetName = ""
  var sheetName = "";
  if (sheetName.length) {
    var sheet = spreadsheet.getSheetByName(sheetName);
    var sheetId = sheet.getSheetId();
    url += "&gid=" + sheetId;
  }

  var token = ScriptApp.getOAuthToken();
  var options = { headers: { Authorization: "Bearer " + token } };
  var response = UrlFetchApp.fetch(url, options);
  var doc = response.getBlob();
  var backupDate = Utilities.formatDate(new Date(), "GMT", "yyyy-MM-dd' 'HH-mm-ss");
  var backupName = spreadsheet.getName() + ".csv";
  var tempFile = DriveApp.createFile(doc).setName(backupName);
  tempFile.makeCopy(backupName, backupFolder);
  tempFile.setTrashed(true);

}

Answer 1

I understood that you are using your code to make CSV backups of your Sheets, and you want each new backup to override the old one. If I understood it well, you are very close from reaching your goal.

After copying the new backup, you only need to delete the old one. This isn't directly overwriting , but has the same result. Immediately after you created your new CSV, you can search for the old one and use File.isTrashed() on it. Please, don't hesitate to ask me any doubts.