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Update backup-and-restore-overview.md #20358

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Feb 24, 2025
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Update backup-and-restore-overview.md #20358

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6 changes: 3 additions & 3 deletions br/backup-and-restore-overview.md
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Expand Up @@ -145,9 +145,9 @@ This section introduces the BR compatibility information for all [Long-Term Supp

> **Note:**
>
> Known issue: in v7.2.0, some system table fields are changed to case-sensitive, which might cause cross-version backup and restore failures. For more details, see [issue #43717](https://github.com/pingcap/tidb/issues/43717).
> Known issue: Starting from version v7.2.0, fields of some system tables in newly created clusters become case-sensitive. However, for clusters that are **upgraded online** from versions earlier than v7.2.0 to v7.2.0 or later, the corresponding fields remain case-insensitive. Restore with system tables from backup taken from clusters with those case-insensitive fields to clusters with the case-sensitive fields or vise verse will fail. For more details, see [Issue #43717](https://github.com/pingcap/tidb/issues/43717).

The following table lists the compatibility matrix for full backups:
The following table lists the compatibility matrix for full backups. For clusters upgraded from a version prior to v7.2.0 to v7.2.0 or later, their behavior is consistent with that of backups from v7.1.0.

| Backup version | Compatible restore versions | Incompatible restore versions |
|:---------|:----------------|:------------------|
Expand All @@ -156,7 +156,7 @@ The following table lists the compatibility matrix for full backups:
| v7.5.0 | v7.5.0 and later | - |
| v8.1.0 | v8.1.0 and later | - |

The following table lists the compatibility matrix for log backups:
The following table lists the compatibility matrix for log backups. For clusters upgraded from a version prior to v7.2.0 to v7.2.0 or later, their behavior is consistent with that of backups from v7.1.0.

| Backup version | Compatible restore versions | Incompatible restore versions |
|:---------|:----------------|:------------------|
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