Backup is designed to store copies of messages which Kaspersky Secure Mail Gateway saves during processing. Copies of messages are stored in Backup in unreadable format and therefore do not compromise your computer's security.
Kaspersky Secure Mail Gateway places copies of the following messages in Backup:
Copies of messages are placed in Backup together with attachments.
The default maximum Backup space is 7,32 GB. As soon as this threshold value is exceeded, the application starts to remove the oldest copies of messages from Backup. When the amount of occupied space is again below the threshold value, the application stops removing copies of messages from Backup.