One one of my backuppc servers (running on a RPI4), I get the
following daily error:

   2022-01-05 01:05:49 Running BackupPC_rrdUpdate (pid=968)
   2022-01-05 01:05:49  admin-1 : ERROR: unknown data acquisition function ''
   2022-01-05 01:05:49 Finished  admin-1  (BackupPC_rrdUpdate)


And running 'rrdtool dump /var/lib/backuppc/log/poolUsage.rrd' gives
the same error:
    ERROR: unknown data acquisition function ''

If remove '/var/lib/backuppc/log/poolUsage.rrd' and run
BackupPC_rrdUpdate manually, the problem goes away
  #rm /var/lib/backuppc/log/poolUsage.rrd
  #sudo -u backuppc uBackupPC_rrdUpdate  
  RRD updated: date 1641427200; cpoolKb 0.000000; total 14345328797.155273; 
poolKb 0.000000; pool4Kb 0.000000; cpool4Kb 736297088.000000

And 'rrdtool dump /var/lib/backuppc/log/poolUsage.rrd' runs without
error.

It seems that somehow the rrd file (poolUsage.rrd) got corrupted...

Not sure what caused this... but
- It might be helpful to add a more descriptive/helpful error message
   to BackupPC_rrdUpdate as this was not simple to track down

- Regardless, hope this helps others who may be encountering this error


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