Backup DB size suddenly reduced/decreased significantly

Hi guys, has any of you experienced a sudden decrease in DB Backup size?
Our db backup was consistently around 200+Mb, until earlier this month became just 10+Mb consistently. (without error, I meant the backups were created, but the backup can’t be used to restore).

In the DEV environment, they are still consistently around 200+Mb.
ERPNext: v12.17.0 (version-12)

Any help is appreciated, thank you in advanced.