Hello,
Answers in line.
Is ACS a true SaaS implementation of Adobe Campaign? What I mean is ACS a true multi tenant solution, so when there is an upgrade all customers get the upgrade at the same time (like Salesforce), the database is shared by all tenants? etc?
Yes, all customers will get the upgrade at the same time(Region wise sometimes)
Is there flexibility in the deployment mode? For example, could I deploy on my own private cloud (AWS) or on prem in our own data center?
No, you can't use it on prem or in your cloud just like Salesforce.
Some people gave told me that on prem is possible, some have said it is a true SaaS solution and some have told me that I can deploy on my own private cloud.
Officially this is not supported, florentlb, can you confirm the same?
Hope this helps!
Amit