I seem to be having a similar issue. Not sure what is causing this, but this is my error message in the Infscape UI:
Error creating directory trans_5/7309/730901 for GET-file with key 7309/730901. File exists (code: 17)
I tried a completely fresh install of an Infscape appliance, error persists. Windows 10 client. It’s incredibly frustrating.
This is an error that will be fixed with the next update which is currently in testing.
Note that this caused the storage to auto-shutdown which might cause storage related errors in currently running backups such as perhaps those you mentioned in the other threads.
Thanks, I eventually worked out that it was a problem with the version of Infscape (I am new to this, so I thought I was doing something wrong) and I resolved it by deploying a new Infscape appliance, but disabling automatic updates. Was a frustrating weekend though ;(