rdiff-backup - 파일을 복원하는 동안 원본보다 작은 백업 폴더/오류

rdiff-backup을 테스트 중인데 누군가가 나를 도울 수 있을 것이라고 생각했습니다. 1: 내 백업이 원본 폴더보다 작은 이유는 무엇입니까? 내 원격 서버에는 36G가 있고 백업 서버에는 29G만 있습니다.

2: 일부 파일을 복구하려고 했지만 다음 오류가 발생했습니다.

Exception '[Errno 13] Permission denied: '/home/brt/backups2/rdiff-backup.tmp.0'' raised of class '<type 'exceptions.OSError'>':
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Main.py", line 304, in error_check_Main
    try: Main(arglist)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Main.py", line 324, in Main
    take_action(rps)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Main.py", line 290, in take_action
    elif action == "restore-as-of": Restore(rps[0], rps[1], 1)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Main.py", line 554, in Restore
    dest_rp.conn.fs_abilities.restore_set_globals(dest_rp)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/connection.py", line 450, in __call__
    return apply(self.connection.reval, (self.name,) + args)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/connection.py", line 370, in reval
    if isinstance(result, Exception): raise result

Traceback (most recent call last):
  File "/usr/local/bin/rdiff-backup", line 30, in <module>
    rdiff_backup.Main.error_check_Main(sys.argv[1:])
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Main.py", line 304, in error_check_Main
    try: Main(arglist)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Main.py", line 324, in Main
    take_action(rps)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Main.py", line 290, in take_action
    elif action == "restore-as-of": Restore(rps[0], rps[1], 1)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/Main.py", line 554, in Restore
    dest_rp.conn.fs_abilities.restore_set_globals(dest_rp)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/connection.py", line 450, in __call__
    return apply(self.connection.reval, (self.name,) + args)
  File "/usr/local/lib/python2.7/site-packages/rdiff_backup/connection.py", line 370, in reval
    if isinstance(result, Exception): raise result
OSError: [Errno 13] Permission denied: '/home/brt/backups2/rdiff-backup.tmp.0'
Fatal Error: Lost connection to the remote system

무슨 일이 일어났으며 어떻게 해결하나요?

감사해요.