Thank you for this. I ended up creating a DO Spaces bucket, putting the backup there, and then restoring from that. To make it work, I had to use the Dry Run option and then manually sync the DNS. But now it is working.
I wish that Hostinger had something akin to DO Spaces, but it doesn't, so I am still trying to figure out my strategy for offsite backups.
Thanks @nebulon for your help!