Here's the backup.log file for the relevant computer
-----------------------
Previous backup seems to have failed, regressing destination now.
Exception '[Errno 28] No space left on device' raised of class '<type
'exceptions.IOError'>':
File "/usr/local/lib/python2.7/site-packages/rdiff_backup/robust.py",
line 32, in check_common_error
try: return function(*args)
File
"/usr/local/lib/python2.7/site-packages/rdiff_backup/restore.py", line
468, in get_fp
Rdiff.write_patched_fp(current_fp, delta_fp, new_fp)
File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Rdiff.py",
line 73, in write_patched_fp
rpath.copyfileobj(librsync.PatchedFile(basis_fp, delta_fp), out_fp)
File "/usr/local/lib/python2.7/site-packages/rdiff_backup/rpath.py",
line 64, in copyfileobj
outputfp.write(inbuf)