N2WS v3.0: A How-to Guide for Archiving to AWS S3 Glacier - N2WS
Cost analysis of using Arq to backup to Amazon S3 Glacier Deep Archive (cheaper than Wasabi & Backblaze)! (Self promotion, but I don't get anything out of it, just wanted to share) :
How To Point Synology Backups to Amazon Glacier using IAM - Wahl Network
S3 Backup: The Complete Guide
Backup Synology to Amazon S3 Glacier With 2 Efficient Ways
Backup Synology NAS to Amazon Glacier - Mike Tabor
Understanding pricing of S3 Glacier Deep Archive for photo backup : r/aws