I can't backup my Exchange

[Minor] From: OB2BAR_E2010_BAR@ex.domen.com "MS Exchange 2010+ Server" Time: 1/14/2015 11:00:10 PM
[170:313] One or more copies of database db1 are already being backed up in a different session.

[Minor] From: OB2BAR_E2010_BAR@ex.domen.com "MS Exchange 2010+ Server" Time: 1/14/2015 11:00:10 PM
[170:313] One or more copies of database db2 are already being backed up in a different session.

[Minor] From: OB2BAR_E2010_BAR@ex.domen.com "MS Exchange 2010+ Server" Time: 1/14/2015 11:00:10 PM
[170:313] One or more copies of database db3 are already being backed up in a different session.

[Minor] From: OB2BAR_E2010_BAR@ex.domen.com "MS Exchange 2010+ Server" Time: 1/14/2015 11:00:10 PM
[170:313] One or more copies of database db4 are already being backed up in a different session.

[Critical] From: OB2BAR_E2010_BAR@ex.domen.com  "MS Exchange 2010+ Server" Time: 1/14/2015 11:00:10 PM
No mailbox database copy can be selected for backup.

[Normal] From: BSM@hpdp.domen.com "ex-server mailbox store" Time: 1/14/2015 11:00:47 PM
OB2BAR application on "ex.domen.com " disconnected.

[Critical] From: BSM@hpdp.domen.com "ex-server mailbox store" Time: 1/14/2015 11:00:47 PM
None of the Disk Agents