No. Although large numbers may hit Google storage limits (this is very unlikely for normal use). Also, if you have several unavailability occurrences or a recurring unavailability occurrence with a large number of instances, you may see performance degrade
No. All your settings are stored in something called the PropertyService, which is provided by Google and linked to your account. This is only accessible by you and none of this information is retained by us.
We wish we didn't! Each permission is tied to a specific function that Google requires us to ask for. These are:
Execute - to allow our AddOn to run
Storage - to allow our AddOn to remember your unavailability settings
Email - to see your email address (so we know which email to change out-of-office settings)
Gmail Settings - to update your email signature and out-of-office
Calendar - to add out-of-office events to your calendar
Locale - to know your settings to ensure unavailabilities are recorded in the right timezone
Background - to allow changes to run (e.g. switching on or off your out-of-office) in the background
We would like to allow you to add your own message to your signature. Unfortunately, the way Google's Gmail signatures currently work, we don't have a good way to do this that won't break our auto-updating of your signature, based on your unavailabilities. Please don't make manual changes as we then won't be able to find the place to make updates and you'll probably end up with duplicates!