Smarter data node selection for backups

[davidby-influx]

ETA: 25 Feb 2026
PR: https://github.com/influxdata/plutonium/pull/4406

When backing up a shard, skip copies with zero bytes, and select the most recently written copy first. Keep trying shard copies from owning nodes until success, or no more copies available.

• New command line flag to backup staleness threshold. When doing incremental backups, skip shards whose last write time is within this duration from the last backup. Defaults to the default cache snapshot write cold duration (cache-snapshot-write-cold-duration, currently 10 minutes.

Relevant URLs

https://github.com/influxdata/plutonium/issues/4229

InfluxDB Enterprise V1 v1.12.3+