---
id: cloud-accounts.backup-fails-but-test-connection-works
url: https://storagestudio.us/faq/cloud-accounts/backup-fails-but-test-connection-works
category: "Cloud accounts"
subcategory: "Other bucket storage (S3-compatible)"
question: "Why does my backup to bucket storage fail when Test connection works?"
alt_questions:
  - "Test connection passes but backup can't connect"
  - "can't connect to storage backup error"
  - "Backup to S3-compatible fails"
  - "Bucket storage backup endpoint error"
  - "Transfers fail but account tests fine"
short_answer: "Older versions could pass Test connection while a backup to non-Amazon bucket storage failed — that bug is fixed, so update and retry. If it persists, check the Bucket and Endpoint URL are set and exactly right."
tags: ["bucket storage", "backups", "troubleshooting"]
related: ["https://storagestudio.us/faq/cloud-accounts/bucket-not-set-transfers-will-fail", "https://storagestudio.us/faq/cloud-accounts/endpoint-url-required", "https://storagestudio.us/faq/cloud-accounts/can-i-back-up-to-a-cloud-account"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# Why does my backup to bucket storage fail when Test connection works?

In older versions, Test connection checked the account while the backup could still fail with a message about connecting to storage on non-Amazon services — that was a bug, and it's fixed. Update Storage Studio and run the backup again; there are no settings to change.

If it still fails on the latest version, check that the **Bucket** is set and correct (a missing bucket passes a simple test but breaks every transfer), and that the endpoint matches your provider's dashboard exactly.