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s3cmd
Official s3cmd repo -- Command line tool for managing S3 compatible storage services (including Amazon S3 and CloudFront).
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kopia
Cross-platform backup tool for Windows, macOS & Linux with fast, incremental backups, client-side end-to-end encryption, compression and data deduplication. CLI and GUI included.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Maybe look into Kopia. It supports backing up to S3 storage and also does encrypt your backups before uploading. In case you're planning to backup to AWS checkout backblaze, they're much cheaper.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.