recovery problem

I want to prepare a backup machine (for disaster management) by
passing only the ARCHIVEDIR directory from another online machine - both
the machines have Postgresql installed. We have sent PGLOG and ARCHIVEDIR.

Previously it was working,but now,when I am issuing pg_ctl start,it is
giving error like this...

postmaster starting
postgres(at)carme:/usr/local/pgsql/data> LOG: database system was shut down
at 2006-04-19 11:56:35 IST
LOG: starting archive recovery
LOG: restore_command = "cp /mnt/server/archivedir/%f %p"
cp: cannot stat `/mnt/server/archivedir/00000001.history': No such file or
directory
LOG: restored log file "000000010000000000000000" from archive
LOG: record with zero length at 0/A70B28
LOG: invalid primary checkpoint record
LOG: restored log file "000000010000000000000000" from archive
LOG: record with zero length at 0/A70AEC
LOG: invalid secondary checkpoint record
PANIC: could not locate a valid checkpoint record
LOG: startup process (PID 7849) was terminated by signal 6
LOG: aborting startup due to startup process failure

Actually I can't take full data backup,everyday.For this reason,I was
using pg_xlog directory.

Please help me,in this stage.

Thanking you
Jayati Biswas