When installing Ubuntu 16.04 I chose to encrypt the file system, and I'm now prompted for a password before Ubuntu will boot.
I'm wondering how secure that makes my content? Specifically:
Is everything on the drive encrypted (including my data)?
How strong is this encryption? (I know, it's a question of time and resources and what password I chose, but I mean in a practical sense ... anyone could bulldoze through my front door, but the average thief doesn't have the resources or inclination to ramraid a house). For example, if I send my laptop for repairs, or if my laptop is lost or stolen, do I need to worry about someone with no really pressing reason to try and decrypt it getting easy access? (I know a similar question was asked here, but that was quite a while ago so perhaps things have changed?)
Also, does the encryption prevent me from either (a) installing the SSD with the encrypted file system into a different device or (b) making a complete backup of the drive (using an live version of Ubuntu, for example) and at some point restoring that backup?
Also, if the entire filesystem is encrypted is there any value in also encrypting my home folder in Ubuntu?