What does the Exchange writer do to the current log file during a shadow copy backup?
How the Exchange writer handles the current log file depends on whether circular logging is enabled/disabled and the backup type currently selected. • When circular logging is disabled, the VSS allows for full, copy, incremental, and differential backups. For each backup type, when the requesting backup/restore application issues the Freeze command, the Exchange store closes the current E0n.log file and renames it to E0nXXXXX.log. The Exchange store then creates another file named E0ntmp.log, and then suspends all write activities to the logs files during the backup. After the backup operation is completed, the requesting backup/restore application issues the Thaw command, Exchange store renames the e0ntmp.log file to E0n.log, and then resumes writing log entries to it. • When circular logging is enabled, incremental and differential backups are not permitted. When freezing a storage group for a full or copy backup with circular logging enabled, the Exchange store stops writing into th
