Column history - save - google-apps-script

Question

small beginner here.
I need to do copy values from one column and paste them in another one.
Firstly, i try something like "saveHistoryColumn". It works, but I do not wanna write variables from A-ZZ......Therefore I was looking for some looping, "Test" worsk, but my question is how to place the original data from B--> A, D-->C etc. in one sheet ? The test copy value from sheet 1 to sheet at same position...
function saveHistoryColumn() {
var ss = SpreadsheetApp.getActiveSpreadsheet ();
var ss1 = SpreadsheetApp.getActiveSpreadsheet ();
var source = ss.getRange ("Sheet1!B15:B20");
var source2 = ss1.getRange ("Sheet1!D15:D20");
source.copyTo (ss.getRange ("Sheet1!A15:A20"), {contentsOnly: true});
source2.copyTo (ss1.getRange ("Sheet1!C15:C20"), {contentsOnly: true});
}
function test () {try {
var spread = SpreadsheetApp.getActiveSpreadsheet();
var sheet = spread.getSheetByName("Sheet1");
var rlist = sheet.getRangeList(["B1:B10","D1:D10"]);
sheet = spread.getSheetByName("Sheet2"); // target will be Sheet1 A1:A10,C1:C10... etc.
for( var i=0; i<rlist.getRanges().length; i++ ) {
var r1 = rlist.getRanges()[i];
var r2 = sheet.getRange(r1.getA1Notation());
r1.copyTo(r2);
}} catch(err) {
Logger.log(err);}}

Answer 1

You can use something like
function backupColumns() {
var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Sheet1");
for(col = 1; col < sheet.getLastColumn(); col+=2) {
var values = sheet.getRange(1, col + 1, sheet.getLastRow(), 1).getValues();
sheet.getRange(1, col, sheet.getLastRow(), 1).setValues(values);
}
}
to copy each even column into each odd if that's what you want