Git: Accessing lost commits

Every time you amend, rebase or reset, git commits get "overwritten".

However, git still allows you to checkout those commits using their SHA1, given you can find it.

One option to do this is

Copygit reflog
# or
git reflog show [BRANCH]

This will show a list of all commits the branch has recently pointed to.

Git might garbage collect those commits eventually, but this should only happen after several weeks.