If you have a blogger blog it’s better to backup your template because you can’t say what will happen in future. If you are trying to change your blogger template it may get corrupted. There are chances you may loose your posts. In such situations backup may help you a lot.
Backup or Restore Blogger Template
When your doing changes to your template if anything goes wrong you can use backup template to restore your template. To backup your template go to your blogger dashboard and click on Template. Now you can see Backup/Restore on top right corner of your screen click on it. In the pop up window you have two options either you can download a copy of your template or you can restore your template if you already have a backup copy with you. You can see the steps in below pic.