> What caused this error? What exactly is this about?
> BackupPC_link got error -4 when calling MakeFileLink(/usr/local/backuppc/data//pc/.../attrib, fb724bb8f200bb12da7015edadf4d5a0, 1)
- you are on a file system that has run out of hardlinks
(use df -i to check),
- the pool (/usr/local/backuppc/data/cpool) is on a different file
system than the pc direcotry (/usr/local/backuppc/data/pc/HOST),
- some permissions problem.