Hello dradb,
Both Google Drive and Dropbox have been reported to work well. Keep in mind that in some cases the amount of storage space needed can widely vary day to day depending on the number of cameras, the resolution you are using and your scenes. For example, if you have a camera pointing out to your backyard there may be days where no one goes back there but if you have a BBQ with a bunch of friends you will receive a large amount of clips.
You can get a rough estimate of the amount of space needed by using the "export to a local folder" feature (
https://www.sighthound.com/support/export-local-folder) and see how much space is used at the end of the week.
I'm unsure of which, if any, cloud services offer automatic file management. A quick search turned up some file management programs that may solve this issue for you. We haven't verified this at all but here is an example of such a program:
http://lifehacker.com/5097718/auto-dele ... rive-clean If you are technically inclined you could write a script to delete files older than X days, or find one that someone else has written.
I hope that helps,
-Devin