If we select a directory which contains device files, they won't be backed up (what's acceptable because not allowed to create them on the backup server), but also no metadata file will be written, what avoids setting of permissions of all other, regular files.
error message when backing up directories which contains device files
error message during restore because no metadata was written
Also only hardlinks lead to missing metadata (tested hardlinks and device files individually!). Message in Sepiola Info pane:
Error occurred while getting ACL's:
getfacl: /home/mike/sepiola_tests/hardlink1.sh\040\075>\040home/mike/sepiola_tests/test2.sh: No such file or directory
directory listing of hardlinked file
Under Mac OS-X, metadata is written and permissions restored successfully, there's only a fault with showing the (non-backed up) device file at top level within the restore selection.
device file displayed within restore selection
problem with hardlinks seems to be fixed in Version 1.9.3 but the problem with device files still persists.