XF 2.1 What does "overwrite files" mean for XF upgrades?

dknife

Well-known member
When upgrading XFMG and XFRM it has a checkbox for overwrite files, by default unchecked. What does this mean?
  1. Overwrites all existing addon files with new versions
  2. Overwrites the downloaded upgrade file in case of corruption
If #1, does that mean by default XenForo keeps a backup of all addon files for downgrading?
 
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