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postgresql - What is a typical Compression Ratio for an SQL Database backup file? - Server Fault
https://serverfault.com/questions/484655/what-is-a-typical-compression-ratio-for-an-sql-database-backup-file
＞ If your DB is full of the same byte repeated then it's going to compress to an extremely small size, maybe a ratio of 99.9% or better. Your data is probable somewhere inbetween, so it'll compress somewhere between 0.1% and 99.9%
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