Comment by nine_k
It takes a couple of months for an unpaid AWS account to get it suspended. Then you have 30 days to reactivate it. Then you have 90 days before the data are actually wiped from the Glacier. You have half a year, or maybe more, to get your backup data.
The price of Glacier Deep Archive is roughly $1/mo per terabyte. (I struggled to produce 500 GB of photos in 15 years.) Set up a dedicated AWS account, put $50 on it, set up a yearly auto-payment of $10, and you're likely safe for several years of nonpayment.
Retrieval is not free though, something like $20-40 for retrieval from tape, and about $90 for a terabyte of egress traffic. Okay for the rare occasion of a full restore.
Backblaze B2 is $6/mo per terabyte, and they only give you 44 days of grace period before deletion for nonpayment. But the traffic is free either way, up to 3x the amount stored per month. They are good for frequent full backups, and for doing full restores periodically.
Yeah I stopped paying for my AWS domain, and they kept sending me new invoice every month for 2 years. (last month I paid all ~24 invoices and deleted the domain).