ran build_usage

docs/usage/check.rst.inc

@@ -66,9 +66,12 @@ Second, the consistency and correctness of the archive metadata is verified:
 - Check if archive metadata chunk is present. if not, remove archive from
   manifest.
 - For all files (items) in the archive, for all chunks referenced by these
-  files, check if chunk is present (if not and we are in repair mode, replace
-  it with a same-size chunk of zeros). This requires reading of archive and
-  file metadata, but not data.
+  files, check if chunk is present.
+  If a chunk is not present and we are in repair mode, replace it with a same-size
+  replacement chunk of zeros.
+  If a previously lost chunk reappears (e.g. via a later backup) and we are in
+  repair mode, the all-zero replacement chunk will be replaced by the correct chunk.
+  This requires reading of archive and file metadata, but not data.
 - If we are in repair mode and we checked all the archives: delete orphaned
   chunks from the repo.
 - if you use a remote repo server via ssh:, the archive check is executed on

docs/usage/mount.rst.inc

@@ -42,3 +42,10 @@ This command mounts an archive as a FUSE filesystem. This can be useful for
 browsing an archive or restoring individual files. Unless the ``--foreground``
 option is given the command will run in the background until the filesystem
 is ``umounted``.
+
+For mount options, see the fuse(8) manual page. Additional mount options
+supported by borg:
+
+- allow_damaged_files: by default damaged files (where missing chunks were
+  replaced with runs of zeros by borg check --repair) are not readable and
+  return EIO (I/O error). Set this option to read such files.