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Update postgres.md (#18445)

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Strac Consulting Engineers Pty Ltd 2025-05-20 23:31:05 +10:00 • committed by GitHub
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Add advice for upgrading between major PostgreSQL versions to the database documentation.

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## Postgresql major version upgrades
Postgres uses separate directories for database locations between major versions (typically `/var/lib/postgresql/<version>/main`).
Therefore, it is recommended to stop Synapse and other services (MAS, etc) before upgrading Postgres major versions.
It is also strongly recommended to [back up](./usage/administration/backups.md#database) your database beforehand to ensure no data loss arising from a failed upgrade.
## Backups
Don't forget to [back up](./usage/administration/backups.md#database) your database!