A huge share of capital investment in security infrastructure is on the storage. Storage is costly and maintenance of storage is even costlier. Argus understands this pain point. So, we uses the existing storage of the NVR/DVR for evidence retention. If it is possible, we use the software features of NVR/DVR to tag, star, label or lock (different brands uses different terms, but functional aspect of the feature is the same) to preserve a video segment of interest.