Backup problem "cannot create temporary file"

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1

Hello,

I’ve had a backup problem for a while now.
In the tasks, I’ve had a maintenance error looping for 3 weeks with the following message :
" Error: error updating maintenance schedule: unable to complete PutBlob(kopia.maintenance) despite 10 retries: cannot create temporary file: unrecognized error when creating temp file on SFTP: /mnt/data/busterwood_studio/qnap-filer1/kopia.maintenance.f.tmp.fb1d0ec9cb477c8e: sftp: “Failure” (SSH_FX_FAILURE)."

“16:17:37.110 got error cannot create temporary file: unrecognized error when creating temp file on SFTP: /mnt/data/busterwood_studio/qnap-filer1/kopia.maintenance.f.tmp.fb1d0ec9cb477c8e: sftp: “Failure” (SSH_FX_FAILURE) when PutBlob(kopia.maintenance) (#9), sleeping for 3.844335937s before retrying”

Do you have any idea where the problem might be coming from ?

Thanks a lot