We were able to replicate the issue. We noticed that the backup was created on Dropbox Premium version but only the API that we were using to detect that backup after its creation was failing to detect the same.
We contacted the Dropbox team regarding the same and they said that the results of the API that we were using are subject to delay. Hence, they suggested some other APIs instead.
We made use of the alternate API and it should work fine now.
I have emailed you the patch with my email id 'priya@softaculous.com' with the instructions to apply it on your server.
Please test the same and let us know if your issue is resolved. If the patch resolves your issue, we'll include the same in next Softaculous version.