@kelly: Please start anew topic and attach a full session log file showing the problem (using the latest version of WinSCP).

Hi, my upload to the Backblaze bucket via WinSCP was cut short when my daily Class C transactions hit the 2,500 free cap. As shown in the screenshot, WinSCP appears to be making a large number of S3 list object calls, which are counted against the free cap for assessing files that have been uploaded.

Could someone explain how WinSCP actually works while uploading files and suggest any ways to mitigate those calls?

See Connecting securely to Backblaze B2 storage/bucket with S3.

There's a small compatibility issue between WinSCP and Backblaze S3 API. It will be fixed in the next release:
Issue 1871 – Workaround for lack of support for max-keys parameter in Backblaze S3 API

Since today S3 API for Backblaze B2 is available for everyone (Public beta). That means we can use it to interact with B2 buckets in WinSCP without waiting for official integration.

BackBlaze B2 cloud support would be much appreciated

Yes! Please! Backblaze's B2 Cloud Storage is awesome. Just voted.

Just as an idea. Maybe it can be relesed as a kind of plugin or the separate ini? The are thousands of cloud storages it be great to connect simply. Peranally I need 3-4 of them, not listed in... Also others may not need to connect it daily.

This request has been added to the tracker:
Issue 1820 – Backblaze support
You can vote for it there.

Backblaze support would be awesome...

Thanks for your suggestion.
We will see, if more people ask for this.

I have always preferred WinSCP over pretty much every other FTP client simply because it is so easy to use, and it integrates nicely with PuTTY so when I log into a Linux server I have both GUI & CLI options available to me. Today though I was searching for a way to easily connect to Backblaze, I used CyberDuck and it continues to crash when trying to remotely move files from one folder to another, and unfortunately I am now considering purchasing FZ Pro because of the integration with Backblaze.

I'd love to help however I can to help get this integrated into the product.

As always, "please & thank you."

Thanks for your suggestion.

Though there are so many cloud storages. We cannot implement them all. If we start doing that, we will for sure start with the major ones, line OneDrive, S3, etc.

Is it possible to integrate WinSCP with Backblaze's B2 cloud storage? There's some software supporting Backblaze however it's either expensive or it doesn't have features that I want and WinSCP does have and I already fell in love with it :)
I think it shouldn't be a difficult task, here's how to do it.