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Duplicity Encrypted bandwidth-efficient backup using the rsync algorithm.

Free•Open SourceMacLinux

Rsnapshot rsnapshot is a rsync based backup utillity

https://alternativeto.net/software/rsnapshot/about/

Borg Backup Deduplicating backup program with compression and authenticated encryption

https://alternativeto.net/software/borg-backup/about/

Lemmy is a great open source federated and privacy respecting alternative to Reddit. Nodes can be self-hosted and posts will sync between them.