I'm currently paying monthly. If I switch to year-at-a-time, will I still get the extra disk space, or was that just an introductory thing?
Yes, you'll get the extra diskspace. I did the switch over to yearly billing for two accounts of mine, and I got the extra space once the billing period was changed.
Just submit a support ticket and request to be switched to yearly billing.
You can mention users to notify them: @username
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