Update zone on slave?

[Mader, Cary J]

Probably a stupid question, but would rather be safe than sorry on this.

Just moved the master name server for a delegated domain to another
location, so it's been down, and it's got a new ip address.   Can I
safely update the zone file on the slave, which was copied from the
master....until the master is getting picked up again?  Assume that once
the master is back up, that the slave will copy the lastest zone file
from the master.

Related question...the slave has an empty zone file that has what
appears to be a generated suffix, so it looks something like
"bar.foo.com.Azx40x", and it has a recent timestamp.  Just curious on
the purpose of that file, perhaps indicates the last time the master was
read?

Cary