If you don't restore all of your incremental backups, the process of
restoring Microsoft Exchange Server databases will cause your current log
files to be deleted.
Any existing log files will also be deleted if an older backup set is
restored and the service started. For example, if a full online backup is
made on Sunday and Monday, and then on Tuesday the backup from Sunday is
restored, when the service is started any logs generated on Tuesday will
be deleted.
Therefore, it is very important to backup any existing log files before
restoring from backup.
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After the restore of the online backup, if ALL the incremental backups are
not restored before the information store is started, Exchange Server will
replay the log files to the point where the log file numbers are skipped,
and then delete the remaining log files. Unless the current log files are
copied to another location before the restore, they are permanently lost,
along with all the messages contained in those log files. This is by
product design.
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