Hello @fdsecarriere 
, welcome to DevKinsta community!
Thank you for reaching us out!
Regarding that DK0065 error, just wanted to check if you checked and followed the solution what’s mentioned on our documentation here ?
That DK0065 error usually could be caused by a failed connection to the remote server (your Staging server) or unpredictable issues related to the uploaded files. This step uses rsync as a tool to share files with the remote site, so anything that can cause rsync to fail can be the root cause of this issue.
On the other thread (similar DK0065 error), my colleague, Kevin, suggested to remove any unnecessary large files (old/unnecessary zip files e.g: from old backups, etc.) both from the local computer and on the staging server (to keep them synchronized) which helped the other user there to solve this failed to upload local site DK0065 issue . So, you may also want to check yours (if there’s such large unnecessary file() that can be removed/deleted) and wondering if it’s the same solution that may help you as well.
Please let us know if we can assist you further.
Cheers,
Agus