Your Postgres-EbqM service has two volumes attached at the same mount path (/var/lib/postgresql/data), and that's what's breaking the deploy. A service can only have one. The two also sit in different regions, so when the container is placed near the first it can't find the second, and creation fails about a second in. That's the "no such file or directory" in your logs: a placement problem, not a damaged disk.

Nothing is lost, and nothing here deletes anything. Both volumes on that service are intact, and so is your older detached postgres-volume.

The fix is one command:

railway volume detach --volume postgres-data-backup

That leaves postgres-volume-j2Z2 attached, keeps every byte on postgres-data-backup, and triggers a redeploy. Run railway volume list first if you want to see both. Please use the CLI rather than the dashboard: the dashboard only offers Delete, not detach, and you have other loose volumes there you don't want to hit by mistake.

One thing worth checking first: Postgres-Production-New has been running fine on its own volume since you created it. If that's your real database now, you can leave Postgres-EbqM alone.