There are 2 ways - 1) rename the c760 backup to be called c860, then the c860 backupsoftware will recognise - however yuo may end up overwriting newer libs with older stuff - so may not be so good.
2) Untar the backup (if you\'re using windows just add .tar to it and winzip will open it) and copy the files you want across manually
I\'d go for the 2nd approach myself, but the 1st may work without any probs
Good luck
Stu