> Actually the subscription doesn't automatically renew. After 30 days they lose it and need to resubscribe, so I think your data should be fine.

As far as I know (And from a cursory google search) it appears they do auto renew

As a subscriber, I can confirm that it does auto-renew.

Also, twitch recently added the option to share the fact that you have paid for another month (by not cancelling) [0]. Taking note of these notifications is possible and would capture some of the resubscription data.

[0] - http://blog.twitch.tv/2015/01/subscription-announcements/

Oh my mistake. I remember a lot of people needing to manually re-sub but I guess they had just turned off the auto-renew option.