Add new backups role in backups account and allow main/group to assume it
user
```hcl
resource "aws_iam_role" "backups_role" {
  name = "backups"

  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::${var.aws_main_account_id}:root"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
EOF
}

resource "aws_iam_policy" "backups_policy" {
  name = "backups-access-policy"

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:ListAllMyBuckets",
        "s3:GetBucketLocation"
      ],
      "Resource": "arn:aws:s3:::*",
      "Condition": {
        "Bool": {
          "aws:MultiFactorAuthPresent": true
        }
      }
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:ListBucket",
        "s3:ListAllMyBuckets",
        "s3:GetBucketLocation"
      ],
      "Resource": "arn:aws:s3:::digitalmarketplace-database-backups",
      "Condition": {
        "Bool": {
          "aws:MultiFactorAuthPresent": true
        }
      }
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject"
      ],
      "Resource": "arn:aws:s3:::digitalmarketplace-database-backups/*",
      "Condition": {
        "Bool": {
          "aws:MultiFactorAuthPresent": true
        }
      }
    }
  ]
}
EOF
}

resource "aws_iam_role_policy_attachment" "backups_role_policy_attachment" {
  role       = "${aws_iam_role.backups_role.id}"
  policy_arn = "${aws_iam_policy.backups_policy.arn}"
}
```
assistant