[Feature request] add backup/restore

[barabasz]

Since docker is recommended installation method and creating (and populating!) beautiful dashboard from scratch is VERY time-consuming there should be backup/restore section in settings (like i.e. in Dashy).

This is partially related to #259

[iAmSaugata]

Hay, you don't have to create every time from scratch, all you have to do is to keep the database backup manually from the volume/mount point (db.sqlite). Hopefully backup will introduce later.

[zilexa]

It makes little sense to build a backup/restore solution. Please don't waste your time to do that.

Flame is the portal to your docker containers (and other stuff), hence the docker folder containing the volume mounts should be backed up, as part of a bare essential backup strategy.

This way you backup each container configuration.

[MyWay]

I agree with the backup/restore feature.