Hidden .dropbox_bi folder storing 87GB of files locally!

I am having the same issue with Windows 10Pro operating system.  

I have an external hard drive automatically backed up via Dropbox, but for some reason a hidden folder "Dropbox_BI " has been created and is utilizing 349GB of hard drive space on the machine that the external hard drive is connected to.  

I found the hard drive space being utilized via TreeSize disk space manager app.

I contacted Dropbox support, via chat, regarding this issue.  They let me know that Dropbox engineers are aware of the problem and are working on a solution, and that I would be contacted by Dropbox support staff soon.

Another update on this. The dropbox_bi folder on a Mac other than the one the large external drive is attached to now has over 500Gb of files under the label of the external drive attached to another computer!

Come on Dropbox, this is going on too long whilst waiting for a decent solution. And it's a solution the Dropbox engineers need to resolve as the first and second line customer service staff don't have a clue (not their fault).

I have the same issue, Win10Pro, My internal C: is completely full thx to the external drive rebound through the internal Dropbox apparently tries to do in the course of backups and this is actually a dangerous situation.  Support told me today to update the desktop app and it will fix (a little skeptical, but let's see).

As others have mentioned, I had to use that TreeSize utility to even find on my own that Dropbox was the culprit to my storage woes, because Windows disk utility doesn't show it and you pull your hair wondering where all the storage went.  That .dropbox_bi folder is hidden beyond hidden - even if you browse your directories to see "hidden" files it doesn't show up.  Which feels downright sneaky but maybe there's a reason - I can find the individual files in the .dropbox_bi by searching for them, it's just the stuff doesn't show up through normal windows explorer browsing.  I thought my internal hard drive was corrupted!!

Hey Anwick and bagofchips, sorry to see you're having an issue with this.

Can we actually reach out to you via email, so we can look further into this?

Hi Hannah, 

With respect, unless you're a Dropbox backend developer who understands the workings behind the scene then no, there's no point, it's a waste of my time and yours and I've wasted too much time on this problem so far. I've had email communications on this for a while now with various customer service personnel and all the suggested options are either not connected with this folder or they were actually guess work with 'wait and see'. 

Hi bagofchips, how are you today?

Can you share your ticket number reference with me, in order to locate it on the system? 

Thank you!