diff -up cyrus-imapd-2.3.7/man/ctl_cyrusdb.8.mancyrusdb cyrus-imapd-2.3.7/man/ctl_cyrusdb.8
--- cyrus-imapd-2.3.7/man/ctl_cyrusdb.8.mancyrusdb	2003-08-10 01:43:14.000000000 +0200
+++ cyrus-imapd-2.3.7/man/ctl_cyrusdb.8	2009-04-10 12:07:48.218667149 +0200
@@ -70,25 +70,32 @@ reads its configuration options out of t
 file unless specified otherwise by \fB-C\fR.
 The
 .I configdirectory
-option is used to determine the default location of the Cyrus databases.
+option is used to determine the default location of the Cyrus databases
+(quotas.db, tls_sessions.db, deliver.db, statuschache.db, annotations.db,
+mailboxes.db and ptclient/ptscache.db). If any database is corrupted,
+cyrus-imapd will abnormally terminate with information in the log.
 .SH OPTIONS
 .TP
 .BI \-C " config-file"
-Read configuration options from \fIconfig-file\fR.
+Read configuration options from \fIconfig-file\fR (location of the Cyrus databases).
 .TP
 .B \-r
 Recover the databases after an application or system failure.  Also performs
 database cleanup like removing mailbox reservations (and any associated
-mailbox files).
+mailbox files). This procedure is executed every time Cyrus starts.
 .TP
 .B \-x
 Used with -r to recover the database only.  (Prevents database cleanup).
 .TP
 .B \-c
-Checkpoint and archive the databases.  Changes to the database which
-are part of committed transactions are written to disk.  Also, a
-\fIhot\fR backup of the databases is made and inactive log files are
-removed.
+Checkpoint and archive the databases. Changes to the databases (with Berkley
+DB-Engine) which are part of committed transactions are written to disk.
+In default configuration Berkley DB-Engine is used for tls_sessions.db,
+deliver.db, statuschache.db and ptclient/ptscache.db. Also, a \fIhot\fR backup
+of the mailboxes.db, annotations.db and quotas.db databases is made and inactive
+log files are removed. Other files are not necessary, because they can be
+recreated without any data loss. Backup is stored in db.backup1 directory
+and older backup in db.backup2 (these directories are rotated).
 .SH FILES
 .TP
 .B /etc/imapd.conf