Backup continues to "run" even after NFS disk is no longer available

**Describe what's wrong**

I started a backup to a disk that is mounted via NFS. Surprisingly my NFS server became unresponsive. Normally I would expect my running backup to enter a state of BACKUP_FAILED, however it continues to be in a state of CREATING_BACKUP.

**Does it reproduce on the most recent release?**

Yes, I am running ClickHouse 24.5.3.5.

**How to reproduce**

1. Mount NFS share as backup disk for Clickhouse
2. Start backup to this disk
3. Shut down the NFS server

**Expected behavior**

Backup entering a state of BACKUP_FAILED.