I've been looking for something like this for a while, to the point where I started writing it yesterday. Thanks for saving my time! :D

I've been running it for the past few hours to put backups of my photos to Glacier. I have zips of each album which vary from a few megabytes to a few gigabytes - in total it's around 40GB. My internet connection isn't that reliable, so around half the uploads have failed with 'Connection Interrupted'. It would be great if they were automatically requeued (maybe at the end of the list?) and were able to be resumed without starting from scratch (I assume behind the scenes uploads are multipart?).