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open-android-backup
Back up your device without vendor lock-ins, using insecure software or root. Supports encryption and compression out of the box. Works cross-platform.
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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.
Is Swift FOSS? If not, Open Android Backup (formerly known as Linux Android Backup) is an open source alternative. The only problem is that it (officially) only supports use with a computer (but you probably could run it through Termux with wireless debugging)
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.