Ugh, the whole permissions thing drives me up the wall.
I think the policy should be: upload your archives, and if anyone still actually cares about their files being mirrored, remove them individually. Problem solved, everyone's happy.
Much of this data is too endangered to care about what someone said on their Geocities page 20+ years ago about rehosting their content. Archiving and ensuring its continued existence should be top priority.
For the record I guess, I have no problem with people re-uploading or editing my work so long as credit is given!