Looking at your error, the backup is failing because Scylla Manager can’t find any files to index on node 10.240.5.5. Since this worked before and now suddenly fails, here’s what I’d check:
First, verify if there’s actually data to backup:
SSH into the failing node (10.240.5.5) and check /var/lib/scylla/data/
Look for your keyspace directories and see if there are any .db files (SSTables)
Run du -sh /var/lib/scylla/data/your_keyspace_name/ to see actual data size
If it shows 0 bytes or the directory is missing, that’s your problem
Check what happened to your data:
Did someone accidentally truncate or drop tables recently?
Was there a major compaction that might have removed all data?
Check if this specific node is properly part of the cluster: nodetool status
Verify the node can see the keyspaces: cqlsh -e "DESC KEYSPACES"
Verify backup configuration:
Double-check your backup task configuration - make sure it’s targeting the right keyspaces/tables
Run sctool task list to see your backup tasks
Compare the working vs failing backup configurations