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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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vaultwarden-backup
Backup vaultwarden (formerly known as bitwarden_rs) SQLite3/PostgreSQL/MySQL/MariaDB database by rclone. (Docker)
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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.
Actually I nowadays make the backups of all the files in the docker host. I use Kopia. There are many ways to set this thing up, but I've used systemd timers and a service job to start a one-shot job for it.
NOTE:
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Hence, a higher number means a more popular project.