you can look at the tables to know the upgrade path here:
Table 4 Supported Cisco Unified Communications Manager Upgrades for Release 6.x and Release 7.x
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/compat/ccmcompmatr.html#wp40122
most of the patches available on CCO are for specific upgrades so check which ones are available to plan the upgrade path.
upgrade guides are here, take some time to review them. how to backup is also covered under DRS, also read the info
Install and Upgrade Guides
http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_installation_guides_list.html
Maintain and Operate Guides
http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_maintenance_guides_list.html
HTH
java
if this helps, please rate
HTH
java
if this helps, please rate