I would also like to ask everyone about suggestions for deep storage of personal data, media etc. 10TB with no need for access unless in case of emergency data loss. I'm currently using S3 intelligent tiering.
I like to use rsync.net for backups. You can use something like borg, rsync, or just sftp/sshfs mount. Its not as cheap as something like S3 deep (in terms of storage) but it is pretty convient. The owner is a absolute machine and frequently visits HN too.
S3 is tough to beat on storage price. Another plus is that the business model is transparent, i.e., you don't need to worry about the pricing being a teaser rate or something.
Of course the downside is that, if you need to download that 10TB, you'll be out $900! If you're worried about recovering specific files only this isn't as big an issue.
Wasabi is the best option for you. 10TB would be around 60$/month and they offer free egress as much as your storage. So you can download upto 10TB per month.
Glacier Deep Archive is exactly what you want for this, that would be something like $11/month ongoing, then about $90/TB in the event of retrieval download. Works well except for tiny (<150KB) files.
Note that there is Glacier and Glacier Deep Archive. The latter is cheaper but longer minimum storage periods. You can use it as a life cycle rule.
I think they'll charge me only when my current monthly statement is enough to charge. Pretty sure I've never been charged so far with my monthly statement being like 0.02€.
Some tens of gigabytes at this point? It's definitely not a lot. Mostly just some stuff that doesn't make sense to keep locally but I still want to have a copy in case a disaster strikes.