How frequently is data backed up in Sentry, and how long is the data retained for?
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Individual events are aggregated into broader issues. Individual events are deleted after the above retention period. When Issues are deleted, all associated events are deleted.

We create regular backups of event data in production. We delete backups 30 or 90 days after creation, depending on data type.
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More information about Data Retention can be found here.
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​This is covered in detail here: https://sentry.io/security/#business-continuity