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got-your-back
Got Your Back (GYB) is a command line tool for backing up your Gmail messages to your computer using Gmail's API over HTTPS.
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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.
As an alternative to using Google's ultra-slow Data Migration tool another option might be to use GYB (https://github.com/GAM-team/got-your-back) to create local backups and then merge those into the account created in Step 3. The benefit of that is, in my experience, that GYB is blazingly fast, even for large accounts.
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.