If you really need 40TB of irreplaceable data, then I think S3 Glacier Deep Archive might be worth looking at. According to the Amazon calculator it's something like $45/month, though of course the data might take a while to get ready if you need to restore it. There are other S3 Storage tiers as well, that are a bit more expensive but offer quicker recovery. Backblaze B2 looks like it would be about $240/month, which is IMHO also pretty reasonable for 40TB. I haven't calculated the initial traffic costs though, I assume the first upload might be a bit costly, but once it's up there, you just pay storage until you need to restore it.
If you can figure out how to split the data into categories, you could save money as well. E.g., which of this data is truly irreplaceable - stuff like personal photos, source code, whatever it is that can never be re-created. If you're running a business, then stuff that needs to be available immediately in order to keep the lights on. Those things needs to be on storage that also gets backed up daily, preferably in full, and preferably to multiple clouds.
Stuff that can be re-created from sources (e.g., rendered outputs) are less critical because in the worst case, you can just spend some days/weeks to re-create it.
Also consider regular offline backups - put it on a tape drive or on some hard disks/SSDs or even optical media (yes, it would take something like 400 BDXL disks to back up 40 TB, but I assume the data doesn't rapidly change) and put it in some offsite storage facility in case your place burns down.
If you can figure out how to split the data into categories, you could save money as well. E.g., which of this data is truly irreplaceable - stuff like personal photos, source code, whatever it is that can never be re-created. If you're running a business, then stuff that needs to be available immediately in order to keep the lights on. Those things needs to be on storage that also gets backed up daily, preferably in full, and preferably to multiple clouds.
Stuff that can be re-created from sources (e.g., rendered outputs) are less critical because in the worst case, you can just spend some days/weeks to re-create it.
Also consider regular offline backups - put it on a tape drive or on some hard disks/SSDs or even optical media (yes, it would take something like 400 BDXL disks to back up 40 TB, but I assume the data doesn't rapidly change) and put it in some offsite storage facility in case your place burns down.