I am very happy using duply, that uses duplicity. Works well both for mounted disks or S3.
I would ignore any recommendations of a sync tool like Dropbox. They will very happy propagate your problem in all your places before you realized it.
So… you need a master password, you can not switch your master password, any password you generate can not be changed in case of leaks or ugly police to change every X days. Plus, having access to your master password give you access to every single password you ever created or will create.
I stay with single master password with random password.
On reddit was very common having multiple communities about same topics, you just subscribe to all. Overtime each would creates its own personality or vanish. It is a natural process.
How considering to show ads and allow to opt out is worse that google? Have you watch Youtube?