It is very easy to check what you video retention is on solinkcloud.com. This will show you to find how long you have HD and SD video. 

On the videos page, find the location and camera that you would like to check retention on. 

Beside the camera name, find the 3 vertical dots for the dropdown menu. 

Click on the three dots, and click on info. 

An overlay shows up over the camera thumbnail showing you the earliest available video on the camera. HD typically has a smaller retention period because HD creates a much larger file size. When grabbing video on an event, we suggest you do it within your HD period to retain the highest video quality.