I used Blackblaze, but in Asia it was not the best solution. For my server in Asia was Wasabi great.
But even better is the Enhance Backup. S3 makes always a full backup, what costs a lot of resources at the server and a lot of storage space.
I used with V11 the Enhance Backup for 30 days and with all 3-4 hours a backup. This used around 50% of the space of the server and needs a very low amount of resources at the server. With V12 there was some issues that case full backups. With this I made less backups to not run out of space.
There I use Alpha VPS in Germany and for the Asian server I use a Server with fixed IP in my office. Before I tested a solution that was a way too cheap, because they restricted the HDD. Backups was working, but moving backups run in issues.