I backup to Amazon Glacier S3 Deep Archive backed buckets. The price is only a little higher for a few TB than other providers, though egress fees in case of restore are a lot higher. That's a tradeoff I'm willing to make as I'd have two have two separate local NAS replicas corrupt or die before I need to rely on the Deep Archive.

For raw backup, I use GCP. Pricing is similar to AWS and the deep storage is easier to use.

For most regular people, I suggest Google Drive or OneDrive because you get the value add of the their ecosystem. With Google, Photos are good. With Microsoft, the Office+OneDrive subscription is a great value.

IDrive.