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rclone
"rsync for cloud storage" - Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Azure Blob, Azure Files, Yandex Files
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RcloneBrowser
Simple cross platform GUI for rclone. Supports macOS, GNU/Linux, BSD family and Windows.
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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.
https://rclone.org/ - really good, and free.
Rclone is the way. I also recommend a GUI for it via: https://github.com/kapitainsky/RcloneBrowser
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.