https://www.backblaze.com/b2/cloud-storage-pricing.html
edit: it integrates with TrueNAS (formerly FreeNAS) so it's been pretty much set-and-forget, but I can check in and see my stuff through their management interface. I do encrypt my docs before uploading, which TrueNAS also supports.
You should be able to accomplish the same, but you may need to either re-organize your stuff or set up multiple tasks.
edit: for clarification, "/mnt/main/media" contains various other subdirectories of Linux ISOs etc., which is why I push /mnt/main/media/Photos specifically.
You can use rclone to backup to an S3 bucket, and then have the S3 bucket set to "instantly" move files to deep archive.
To retrieve them, you will need to run an extra command to "unarchive" them for some period of time.
I find this easier than trying to interact directly with any Deep Archive API.
It is very cheap, and AWS's durability guarantees are impressive.
Main S3 page, linked to a note about Deep Archive https://rclone.org/s3/#glacier-and-glacier-deep-archive
The only thing I am not sure on is how to quickly restore a large number of files in a bucket from GDA to S3. It obviously can be scripted, but I don't have that handy. I only keep a small number of large, previously encrypted files in it, so I manually restore from the GUI.
(By the way, rclone can transparently encrypt files and filenames client-side!)
1TB = 3.2€
5TB = 10.9€
10TB = 20.8€
...
https://www.hetzner.com/storage/storage-box
No transfer fees.
You can use rclone as one simple tool.
Found it a lot easier than rolling my own AWS Glacier solution.
The pro is that it has a client and, once setup, it just works.
The con is that it's a client running on a single system and the personal pricing plan doesn't support a NAS I believe. I periodically copy my files over from a RAID NAS to a local USB.
I'm using CrashPlan for Small Business, so I can backup select NAS shares as well. $10/month.