|  | @@ -489,6 +489,13 @@ using ``nfs=nostale_ro``. Doing so implies mounting the filesystem read-only.
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				|  |  |  Another option is to not consider inode numbers in the files cache by passing
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				|  |  |  ``--files-cache=ctime,size``.
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				|  |  |  
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				|  |  | +Why are backups slow on a Linux server that is a member of a Windows domain?
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				|  |  | +----------------------------------------------------------------------------
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				|  |  | +
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				|  |  | +If a Linux server is a member of a Windows domain, username to userid resolution might be 
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				|  |  | +performed via ``winbind`` without caching, which can slow down backups significantly. 
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				|  |  | +You can use e.g. ``nscd`` to add caching and improve the speed.
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				|  |  | +
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				|  |  |  Security
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