Backup the switch configuration

[TimStallard]

We should be backing up the config on our switch. Would be ideal if this could get put into the existing sown backup scripts, and therefore get properly copied onto the backup servers etc.

[trickeydan]

Changed name, it implied that there was a second, backup switch

[drn05r]

@trickeydan I know you made some security improvements to the switch config and presumably manually took a backup of this config. Did you make any progress on automating switch config backups?

[trickeydan]

I didn't, but we probably want to utilise something like https://github.com/ytti/oxidized

Alternatively we could write our own equivalent and stick it on cron, shouldn't be too hard.