Cumulus Support

I am a fairly new user to Cumulus and have a question about the trends graphs. On my installation I noticed that when Cumulus is restarted, I lose fidelity of the trends graphs and it reverts to the station's history log. In other words, after a restart of the Cumulus service, I no longer see points every minute, but instead see them every 30 minutes. Is this correct behavior or do I have something misconfigured?

If this is correct behavior, then I would like to change my station log interval to something more frequent. Since I have a Davis Vantage Vue, can I change the log interval or will I lose all my history when I do this?

I apologize if this has been discussed in the past, but I was unable to find any details.

Yes, this is correct behaviour.
If you do change the logging interval of your Vue then I understand that the logger will be cleared of data. That won't be a problem if you have recently run Cumulus.
Make sure you change the logging interval on Cumulus too.
Finally, be aware that if you use a one minute logging interval them your logger will only be capable of storing about two days of data. You need to ensure you don't leave Cumulus switched off for longer than this period otherwise you will not be able to download the oldest data.

I have updated the logging interval to 1 minute which should give me 42 hours. I might consider updating to a longer interval when I go on vacation just in case something happens and I am not available. Here is the amount of time before the logger fills up based on the logging interval.

1 Minute Archive Interval . . . . . . . . . . . . . . . . . . . . . 42 hours
5 Minute Archive Interval . . . . . . . . . . . . . . . . . . . . . 8 days
10 Minute Archive Interval . . . . . . . . . . . . . . . . . . . . 17 days
15 Minute Archive Interval . . . . . . . . . . . . . . . . . . . . 26 days
30 Minute Archive Interval . . . . . . . . . . . . . . . . . . . . 53 days
60 Minute Archive Interval . . . . . . . . . . . . . . . . . . . . 106 days
120 Minute Archive Interval . . . . . . . . . . . . . . . . . . . 213 days