Rewrite and add notes on TemplateBasedVM directories (QubesOS/qubes-issues#1336)

en/managing-os/templates.md

@@ -7,46 +7,71 @@ redirect_from:
 - /wiki/Templates/
 ---
 
-Templates
+TemplateVMs
-=========
+===========
 
-Every AppVM in Qubes is based on some template, this is where all the software
+Every TemplateBasedVM in Qubes is, as the name implied, based on some
-available for AppVMs is installed. Default template is based on Fedora, but
+TemplateVM. The TemplateVM is where all the software available to
-there are additional templates based on other Linux distributions, or with some
+TemplateBasedVMs is installed. The default template is based on Fedora,
-additional software installed by default. This concept is described
+but there are additional templates based on other Linux distributions. There
-[here](/doc/GettingStarted/#appvms-domains-and-templatevms).
+are also templates available with or without certain software preinstalled. The
+concept of TemplateVMs is initially described
+[here](/en/doc/getting-started/#appvms-domains-and-templatevms). The technical
+details of this implementation are described in the developer documentation
+[here](/en/doc/template-implementation/).
+
+Some templates are available in ready-to-use binary form, but some of them are
+available only as source code, which can be built using
+[Qubes Builder](/en/doc/qubes-builder/). In particular, some template "flavors"
+are available in source code form only. Take a look at the [Qubes Builder
+documentation](/en/doc/qubes-builder/) for instructions on how to compile them.
 
-Some templates are available in ready to use binary form, but some of them are
-only as a source code, which can be built using [Qubes Builder](/en/doc/qubes-builder/).
-Especially some templates "flavors" are available in source code form only.
-Take a look at [Qubes Builder
-documentation](https://github.com/QubesOS/qubes-builder/blob/master/README.md)
-how to compile them.
 
 ITL Supported templates
 -----------------------
 
-For those templates ITL is responsible for build and releasing updates,
+These are templates which ITL is responsible for building and releasing updates
-especially ITL guarantees that the binary updates are compiled from exactly
+for. ITL guarantees that the binary updates are compiled from exactly the same
-the source code we publish.
+source code as we publish.
+
+ * Fedora (default base template)
+ * [Fedora - Minimal](/en/doc/templates/fedora-minimal)
+ * [Debian](/en/doc/templates/debian/)
 
--   Fedora
--   [Fedora - Minimal](/doc/Templates/FedoraMinimal)
--   [Debian](/en/doc/templates/debian/)
 
 Community Supported templates
 -----------------------------
 
-Those templates are supported by Qubes Community. Some of them are available in
+These templates are supported by the Qubes community. Some of them are
-ready to use binary package (built by ITL), some are only in source code form.
+available in ready-to-use binary package form (built by ITL), while others
-In any case ITL does not provide updates for those templates, but such updates
+are available only in source code form. In all cases ITL, does not provide
-can be provided by template maintainer.
+updates for these templates. However, such updates may be provided by the
+template maintainer.
 
-In short - by installing those templates, you trust not only ITL and
+By installing these templates, you are trusting not only ITL and the
-distribution maintainers, but also the template maintainer. It can also happen
+distribution maintainers, but also the template maintainer. In addition,
-that those templates are somehow less stable, because we do not test them.
+these templates may be somewhat less stable, since ITL does not test them.
 
--   [Whonix](/en/doc/templates/whonix/)
+ * [Whonix](/en/doc/templates/whonix/)
--   [Ubuntu](/en/doc/templates/ubuntu/)
+ * [Ubuntu](/en/doc/templates/ubuntu/)
--   [Archlinux](/en/doc/templates/archlinux/)
+ * [Archlinux](/en/doc/templates/archlinux/)
+
+
+Important Notes
+---------------
+
+ * Whenever a TemplateBasedVM is created, the contents of the `/home`
+   directory of its parent TemplateVM are copied to the child TemplateBasedVM's
+   `/home`. From that point onward, the child TemplateBasedVM's `/home`
+   is independent from its parent TemplateVM's `/home`, which means that any
+   subsequent changes to the parent TemplateVM's `/home` will no longer affect
+   the child TemplateBasedVM's `/home`.
+
+ * Once a TemplateBasedVM has been created, any changes in its `/home`,
+   `/usr/local`, or `/rw/config` directories will be persistent across reboots,
+   which means that any files stored there will still be available after
+   restarting the TemplateBasedVM. No changes in any other directories in
+   TemplateBasedVMs persist in this manner. If you would like to make changes
+   in other directories which *do* persist in this manner, you must make those
+   changes in the parent TemplateVM.