I’ve got one with HostHatch that’s 10TB of space for $10/month. It was an offer they had during Black Friday 2020. They had a similar offer during Black Friday 2023 but I think it was around $20/month, paid yearly.
I live in the San Francisco Bay Area and my storage server is in Los Angeles, which is around 10ms round-trip ping time from my home internet connection.
Hetzner is good too. They have relatively cheap “storage boxes” that are a shared environment rather than a VPS. You don’t get proper SSH access, but they do support FTPS, SFTP, Samba, Borgbackup, Restic, rclone, rsync and WebDAV. www.hetzner.com/storage/storage-box
Borgbackup encrypts the backups, so the host won’t be able to actually view your backups.