[tor-relays] how sensitive is relay 'state' file?

[starlight.2014q3 at binnacle.cx]

Can anyone comment on how sensitive the
information in the relay 'state' is?
In particular, if entry guards are
recorded in the file should one be
concerned about protecting the file
via

a) encrypting the file system where it resides

b) making a point of not backing up the file

I suppose it comes down to how likely
it is that an adversary can use entry guard
information for correlation attacks against
past and present tor-client traffic
originating from a targeted client-relay.