I periodically move unused files to one of my servers. What I would like to
do is drop any unused file that has been unused for say more than 6 months?
I would like to not drop all unused files.

> It strikes me that this is quite similar to how git handles deleting
> stale refs with the reflog. So, if `git annex unused` were changed to
> also look at the reflog, it would keep all files referred to by all refs
> in the reflog, until the reflog expires. You could then set reflog expiry
> to 6 months, and be done.
> 
> However, I think that many users expect git annex unused to be able to
> immediately find and remove a file after it's been deleted. So this
> probably needs to be a configurable behavior. --[[Joey]]
