Thank you @Jay_Clifford !
I haven’t set the retention policy, so I think that there is a default value. How i can see and modify that?
It is important because I would monitor a measure for at least 1 month and after, use this data.
About the size of the archived data, I monitored the change of the size file every hour to make an estimation of the space needed for 1 month: approximalty 3 MB per hour and then 2 GB in a month. Does this make sense? Or there are other parameter that i need to consider in order to estimate it?