Findings were:
1. Alert images are in the "Alerts" folder. They are small, between 20 to 110KB.
2. DAT files are there too. 3MB+ each.
3. "Alerts" storage is set to be 1GB in general settings.
4. Folder is indeed 1GB approx.
5. There were 980MB of DAT files

6. Turned them off on all cameras. Deleted all DAT files.
Looking forward to a long and useful Alerts list
