From 2676c5fae8e10c33f9b91d275633f9812160d852 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Antoine=20Beaupr=C3=A9?= Date: Tue, 16 Dec 2014 11:16:30 -0500 Subject: [PATCH 1/2] document that multiple clients can backup to a single remote answer comes from author here: http://librelist.com/browser//attic/2014/11/11/backing-up-multiple-servers-into-a-single-repository/#e96345aa5a3469a87786675d65da492b this should address the last remaining issue in #60 --- docs/faq.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/docs/faq.rst b/docs/faq.rst index 849c82e3..0844ee32 100644 --- a/docs/faq.rst +++ b/docs/faq.rst @@ -12,6 +12,17 @@ Can I backup VM disk images? Yes, the :ref:`deduplication ` technique used by |project_name| makes sure only the modified parts of the file are stored. +Can I backup from multiple servers into a single repository? + Yes, but in order for the deduplication used by Attic to work, it + needs to keep a local cache containing checksums of all file + chunks already stored in the repository. This cache is stored in + ``~/.cache/attic/``. If Attic detects that a repository has been + modified since the local cache was updated it will need to rebuild + the cache. This rebuild can be quite time consuming. + + So, yes it's possible. But it will be most efficient if a single + repository is only modified from one place. + Which file attributes are preserved? The following attributes are preserved: From effab97d11de60d93c6af68a6c947c39d17be0e9 Mon Sep 17 00:00:00 2001 From: anarcat Date: Thu, 5 Mar 2015 09:06:20 -0500 Subject: [PATCH 2/2] clarify that simultaneous backups may be a problem --- docs/faq.rst | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/docs/faq.rst b/docs/faq.rst index 0844ee32..cb077cc0 100644 --- a/docs/faq.rst +++ b/docs/faq.rst @@ -21,7 +21,9 @@ Can I backup from multiple servers into a single repository? the cache. This rebuild can be quite time consuming. So, yes it's possible. But it will be most efficient if a single - repository is only modified from one place. + repository is only modified from one place. Also keep in mind that + Attic will keep an exclusive lock on the repository while creating + or deleting archives, which may make *simultaneous* backups fail. Which file attributes are preserved? The following attributes are preserved: