AWS is leading cloud services provider for various platform like compute,Storage,DB and lot more in their offerings. Zerto and AWS will be good solution for DR solution that you are looking out.Zerto offers on-premises DR and on AWS for your virtual environment.
As part of partner,AWS offer free training resource and accreditation certificate here is mine
To obtain your partner certificate logon to AWS APN portal>training.
When comparing TCO,Amazon provide TCO calculator for charge difference on premises and AWS.
I’m still in discovering solutions,stay tune for updates.