1Password 8 and 7 installed.

Hi, I am not sure if this is where I post this but I will do so in the hope I get an answer.
I have version 8.6 and seem to get along with it okay except it does not seem to fill in passwords as well as the previous version I had version 7. However, I still have both on my system and am not sure whether I delete the older version as sometimes they get mixed up. I am paranoid about losing my password data if I do the wrong thing so firstly can I back up the common data file in case of a mess up and how do I delete the older version. Just deleting anything saying version 7 looks too simple as in the past on other program I have deleted I had to do it in a certain way.
Please advise

David