Google Apps Script to zip all revisions of all files in a directory and put it somewhere

zip_all_revisions.js

// Drive service needed (in the sidebar, click the "+" next to "Services", select "Drive", then click "Add")

// To get a folder/file ID: Right click on Drive, Get link, manually copy the last part
const FOLDER_TO_BACKUP_ID = ScriptProperties.getProperty("Source Folder ID") || "... default folder ID ..."
const FOLDER_DEST_ID      = ScriptProperties.getProperty("Dest Folder ID")   || "... default folder ID ..."

const ZIP_NAME = "SOMETHING_backups.zip"

function zipAllFileVersionsInDirectory() {
  let myFolder = DriveApp.getFolderById(FOLDER_TO_BACKUP_ID)
  let filesIterator = myFolder.getFiles()

  let blobsToZip = []

  while (filesIterator.hasNext()) {
    let file = filesIterator.next()

    Drive.Revisions.list(file.getId()).items.forEach((rev, i, {length}) => {
      console.log(`Pinning and fetching "${file.getName()}" revision [${i + 1}/${length}]`)
      
      Drive.Revisions.update({pinned: true}, file.getId(), rev.id)

      let revBlob = UrlFetchApp.fetch(rev.downloadUrl, {
        headers: {
          Authorization: "Bearer " + ScriptApp.getOAuthToken()
        }
      }).getBlob()

      revBlob.setName( file.getName()                                   // Directory inside zip
                         + "/" + rev.modifiedDate.replaceAll(':', '_')  // Use modified date as file name inside zip
                         + "." + file.getName().match(/\.[^.]*$/)[0] )  // Keep extension

      blobsToZip.push(revBlob)
    })
  }   
  
  console.log(`Creating ${ZIP_NAME}`)
  let zipBlob = Utilities.zip(blobsToZip, ZIP_NAME)

  let folder = DriveApp.getFolderById(FOLDER_DEST_ID)
  console.log(`Storing zip at ${folder.getName()}/ (${folder.getUrl()})`)
  folder.createFile(zipBlob)
}