Are there good alternatives?
Quit thinking the world owes you anything. Get your own domain. Get it hosted. Use your own server/domain.
It takes moments to set up something like cosm using rrdtool.
Pachube/Cosm has been very flakey.
And,...the reason I'm looking for a service on the web instead of rolling my own is simple, I live in the land of flakey power and don't want to take on the expense of trying to keep something online 24x7 out in the country.
So, back to the OP's question. What are the alternatives to Cosm? If there are any.
If you have your own domain, and your own web-hosting company hosting that domain (you do not have to do it yourself), they are responsible for keeping it online.Of course, in the event of a power loss at your location, I'm not sure how you expect to access any web server.
Do you mean services that someone else pays for?
Don't misunderstand, money definitely is a concern, but a reasonably priced service to store data and provide tools to manipulate and display it would be nice.