XADM: Procedure Used During Backup

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1. Call HrBackupPrepare to get a client-side context handle and to specify the backup method. In this call, specify the type of backup that will be performed: Full or Logs Only (Logs Only is for differential or incremental backups). Under certain situations, a differential or incremental backup may not be possible. These situations include times when a full has not been performed since a defragmentation or migration has been performed on the database, transaction log files are out of sequence on the disk, or Circular Logging is enabled on the database. If HrBackupPrepare fails for the type of backup you wish to perform, a full backup should be performed before retrying a differential or incremental backup.
2. Perform this step for full backups only. Call HrBackupGetDatabaseNames to get a list of the files to backup. These files cannot be backed up using normal file copy routines and must be backed up using HrBackupOpenFile and HrBackupRead. Each file returned will be preceded by a one-byte token (defined in EDBBCLI.H) that indicates the type of file. Save this token along with the data backup so it can be matched with the proper directory returned by HrRestoreGetDatabaseLocations at restore time.
3. Perform this step for full backups only. Call HrBackupOpenFile to open the file for each file in the list returned by HrBackupGetDatabaseNames. When the file has been successfully opened, call HrBackupRead to read the data in that file. When the file has been read and stored to the desired location, call HrBackupClose.
4. This step should be performed for full backups only. Release the memory returned by HrBackupGetDatabaseNames by calling BackupFree on it.
5. Call HrBackupGetBackupLogs to get a list of transaction log files to backup. These files are all located in the current log file path (configurable in Microsoft Exchange Administrator). If you are performing a full backup, one of the files returned in this list will be a patch file. This patch file contains the changes that occurred to the database while the backup was running. As with the files returned by HrBackupGetDatabaseNames (step 2), each file returned by HrBackupGetBackupLogs will be preceded by a token indicating the file type which should be saved and matched with tokens returned by HrRestoreGetDatabaseLocations at restore time.
6. Call HrBackupOpenFile, HrBackupRead, and HrBackupClose for this list of files in the same manner as step 3.
7. Release the memory returned by HrBackupGetBackupLogs by calling BackupFree on it.
8. This step should be performed for full and incremental backups only (not differential). Call HrBackupTruncateLogs to delete the log files.
   
   NOTE: Do not call HrBackupTruncateLogs if the backup is unsuccessful. If you call HrBackupTruncateLogs and you don't have a successful backup, your database will not be recoverable if it is interrupted before a clean shutdown.
9. Call HrBackupEnd to release the backup context.