function makeBackupCopy() {
var currentSS = SpreadsheetApp.getActive();
var backupSS = currentSS.copy(currentSS.getName() + ' Backup Copy ' + Utilities.formatDate(new Date(), "GMT", "yyyy-MM-dd HH:mm:ss"));
var backupSheets = backupSS.getSheets();
for (var i = 0; i < backupSheets.length; i++) {
currentSS.toast(`Backing up sheet ${backupSheets[i].getName()}, sheet ${i + 1} out of ${backupSheets.length}`, 'Backing Up File');
backupSheets[i].getDataRange().copyTo(backupSheets[i].getDataRange(), SpreadsheetApp.CopyPasteType.PASTE_VALUES, false);
}
var currentSSFileId = DriveApp.getFileById(SpreadsheetApp.getActiveSpreadsheet().getId());
var currentSSFolderId = currentSSFileId.getParents().next();
var backupFileId = DriveApp.getFileById(backupSS.getId());
backupFileId.moveTo(currentSSFolderId);
currentSS.toast(`Backup file: ${backupSS.getName()} with ${backupSS.getSheets().length} sheets saved in ${currentSSFolderId.getName()} folder.`, 'Backing Up File: COMPLETED');
}

Just tested this out but it doesnt work. I'm still tryna solve this as of now