Backup only forks that are ahead of upstream #498
Description
What would you like to happen?
I often create forks for single PRs, and forget to delete them after the PR is merged. So I'm backing up many repos with no unique data. I do have some forks with meaningful changes though, and I want to ensure those are backed up.
Before backing up a fork, we could query the GitHub API to only continue if it's ahead of upstream. I guess this would need a new argument too, maybe --forks-only-ahead?
Unknowns
This might have some edge cases, like repos that merge manually rather than PRs, but in my case it would reduce backup size by more than half.
Workarounds
Deleting forks after my PRs merge. A bit annoying, but better than nothing.