Not everyone is a fan, some are real fans, but you need to assess it for yourself. You may think the additional features are not worth the additional cost, but they might be.
I can offer no advice about the specific question you are asking, as having done the risk analysis and usage cases I do my own backups on 4TB disks that I handle myself.
I figured that your use case was sufficiently different that it wouldn't be your choice, but I thought it worth mentioning to give you something against which to compare other options.
Good luck with the search - do blog about the search and your chosen solution, then submit that here.
https://www.tarsnap.com/
Not everyone is a fan, some are real fans, but you need to assess it for yourself. You may think the additional features are not worth the additional cost, but they might be.
I can offer no advice about the specific question you are asking, as having done the risk analysis and usage cases I do my own backups on 4TB disks that I handle myself.