I actually have snapshots for every 30 minutes back to Feb 2009, but I thought one per month would be enough. I'm considering summarising and cross-connecting

I actually have snapshots for every 30 minutes back to Feb 2009, but I thought one per month would be enough. I'm considering summarising and cross-connecting items, but this was easy enough and gives most of the useful information. The 80/20 rule, and all that.