What files can I delete to free up disk space?

After less than a week of firewall data, I'm using about 10GB -- so for the long term I have a couple questions:

1) Are there files that I can periodically delete to free up disk space? I am using Checkpoint logs with an LEA connection. After a couple days, some files showed up in the "Archived Files" section, so I deleted those. However, the majority of disk space is still being used up by files in the Firewall/server/default/archive directory. If the data is already in the mysql database, can these archive files be deleted?

2) When the mysql database itself reaches massive sizes a few months down the road, is there a way to purge data that is older than a certain date? In other words, purge everything except the most recent XX days of data?

Thanks,
Eric