Read the full announcement of the Live Tracking feature here: https://raider.io/news/159-introducing-raiderio-live-tracking
Raider.IO Automatic Combat Log Archiving is a feature in the latest Raider.IO Desktop Client that makes it simple for you to always log without needing to worry about your log files growing too large.
The way this works is when your log exceeds 1GB in size it will automatically try to archive the log only if the log hasn't been modified in the past hour.
That way it will just be archiving the log when you aren't actively playing.
All archives will be placed into the RaiderIOLogsArchive folder. You'll want to clear this out every now and then as this can accumulate a lot of space over time.