Example, medium site, 50 TB/month
1 pair of ECE instances with 2 services (www (AWS ALB) and static (AWS S3)). 50TB/month shared 10TB/month for www and 40TB/month for static.
Costs:
Monthly at AWS: $4,403.11
Monthly at Efficient Cloud:
$1,907.91 (Save 56.7%)
Instance maintenance: 365 credits/month
for the data transfer: 51,200 credits/month
Total credits 51,565 credits/month.
Buying a pack over 51,200 credits, the credit cost is: $0.037
51,565 x $0.037 = $1,907.91
Prepaying a year at Efficient Cloud:
$1,701.65/month (Save 61.4%)
12 x Instance maintenance: 4,380 credits
12 x for the data transfer: 614,400 credits
Total credits 618,780 credits
Buying a pack over 512000 credits, the credit cost is: $0.033
618,780 x $0.033 = $20,419.74/year, about $1,701.65/month.
Remaining data transfer monthly cost at AWS will be: 10TB * $0.01 (intraregion) + 40TB * $0 (S3) = $102.4/month.