Memory usage

Last saturday i installed Comodo Backup on my server with Windows Server 2008 R2.
This morning i had to start a virtual machine. but: no memory left! 92MB of the 8 GB free!
I thougth: what is changed? Comodo installed and runned for a scheduled backup.
i looked up in the resource monitor and i found out that i had more than 3 GB in the modified area.
afther i stopped the service SynchronizationService of Comodo, the modified area started decreasing.
have a look at the attached screenshots.

please advice!

version 2.2.127000.12

[attachment deleted by admin]


We need some more information:
Did you have an old version of Comodo BackUp installed, before installing 2.2?
Did you set a schedule to run?
Is the issue reproducible?