Why do you need it? With every backed up file it becomes more and more outdated. If anything happens all you need is to create storage account, pick the same bucket and rebuild the database.
Go to Tools -> Options -> Repository tab -> Synchronize
CLI:
cbb.exe account -l
cbb.exe account -s "accountname"
-l will list all account
To move it:
cbb.exe option -databaseLocation path
(where "path" is a new repository file destination. As a result, the CBBackup.db file will be moved to the new location.)
Or just click Tools -> Options -> Repository tab -> Shield icon
Make sure that you don't have any running plans.