Archive files gone?

Got this today:
> Warning: No archive files were found for these roots, whose canonical nam=
es are:
> /Library/WebServer/Documents/UG
> /Volumes/GF1500/UG
> This can happen either
> because this is the first time you have synchronized these roots,  or bec=
ause you have upgraded Unison to a new version with a different
> archive format. =20


It's far from the first time=E2=80=94been doing it one to three times a wee=
k since March.
And =E2=80=A6/unison/2.53.7 was installed before that and not modified sinc=
e.
Nor have I deleted anything in ~/.unison

The message goes on to suggest a DHCP issue, but DHCP cannot change my loca=
l hostname, and both roots are local.  I downloaded the PDF manual, but the=
 discussion of UNISONLOCALHOSTNAME is not helpful.  Am I supposed to set it=
 to the output of `hostname`?

I did take the laptop out of the house today and connect it to the WiFi at =
the hospital, but that can't change the hostname and I did not run unison w=
hile there.  Even if the hospital could have changed my defined hostname (i=
t CAN'T), the above messages happened after I returned home and got back on=
 my own LAN.

Those diagnostics happened this evening, and the previous unison sync was f=
our days ago.

--=20
Wes Groleau
=E4=BC=9F=E6=80=9D=E7=A4=BC

=E2=80=9CI may not have remarkable victories, but I can amaze you with the =
defeats I survived.=E2=80=9D
    =E2=80=94 Anton Chekhov


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