For servers, just something rsyncable - rsync.net lately.
Avoid them if you can. Anyone willing to use UI tricks to keep you as as customer can’t be trusted and what’s the point of a backup if you can’t trust it.
No cancel button. Read the online documentation. To cancel you have to delete all your computers from your profile which deletes the underlying backups.
The yearly charge will be authorized in the days before your subscription expires “so there’s no interruption in service.” But you can’t tell them you want to cancel without deleting all your backups and you don’t know when the charge is going to renew.
So in order to use you’re full subscription you’ll need to set an alarm to cancel on that day, and then go ask for a refund because they’ve already charged you for the next year.
It’s an intentional dark pattern to make cancelling difficult.
Your explanation sounds like their process is slightly less intuitive than it could be.
I'm not overly impressed that they auto-increase business licenses if a "new" computer is detected, but their response to fix the issue was prompt, so I'm generally willing to give them the benefit of the doubt.