I'm constantly switching camera sites, and the type of sites I want to monitor, depending on the time of year. I no longer use salt licks due to CWD fears, so in late summer and early fall, I focus on food plots or other focused food sources. By mid-September I start switching a few cameras to the most traditional scrapes in the area, hoping to catch the first buck visits. In November, most of my cams are on scrapes, and I may switch from scrape to scrape trying to get a full inventory of the bucks in the area (two scrapes 100 yards apart may be being used by completely different bucks). Post rut, I'm back to food sources again.
Running 8 cameras, from August until now I've already used 38 different camera locations.
I've switched to all video for a number of reasons. With still cameras, especially in night pictures, the only stills you get may be motion blurred. That never happens with night video. Often deer are following the one that triggered the camera, but still images often don't catch those. Video does. And although videos technically don't have the resolution of stills, I find the "mind's eye" can identify and recognize antlers in motion in video mode much better than a grainy or blurred still image. Plus, I've learned more about deer behavior from two years of running video mode than I have in 20 years of running still image cameras, and 20 years of still image cameras taught me a ton! The big downsides to video are the storage capacity (only 10 seconds of HD video is 50 MB, 20 seconds 100 MB), and the time it takes to go through all the videos. VERY time consuming compared to stills.