The delta.logRetentionDuration (default 30 Days) is  generally not set on any table in my workspace. As per the documentation you can time travel within duration of log retention provided delta.deletedFileRetentionDuration also set for 30days. Which is the case for my below example. We do vacuum with retain for 30days every weekend.

2 questions I have on this matter

• Why I can still go back to April 22nd in version which is more than 30 days?
• Why version numbers starts from 100, what happened to previous versions?
  

https://docs.databricks.com/gcp/en/delta/history

#delta #vacuum