You could try something S3 based, and do backups by date?
For example, export a subset of the DB and name it accordingly (ie. 2025-04-to-2025-01.tar).
If you do that there are a lot of pretty cheap S3 providers (like Wasabi).
S3 interfaces nicely with RCLONE so you can move providers etc and pull it really quickly.
As an aside, when I looked into something like this the thing that made me hesitate was the time and cost for retrieval from cold storage (like amazon glacier) outweighed the savings.
I’m finding that trope is even worse with daybreak 1 (I just got to the intermission).
A lot of the characters dote on the silly protagonist too much. I miss the strong and driven heroes from sky and crossbell.