I have 6 cams now (up to 10 in the future). My vendor (reolink) doesn't support my model (RLC-410-5mp) in their own cloud. (at the same time my cameras support https for browser access and stream endpoint also https)
I think I need 60 - 80 GB of storage. I have plans to store video files only on the cloud (no local system). If the cost would be high for me, then I'll do my own "home" cloud (save stream from remote cameras on some private location using vpn + ispy).