If the client (agent) was down, then the server will consider the platform as being down.
It's a little bit tricky to answer your question regarding how long the data is being kept. We compress the data and store avg/min/max over windows into different tables, each is set for different window size and range. Overall, the oldest data in HQ will be purged after 1 year. This is configurable in the database.
You can check the space by monitoring the database used by HQ :-).
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