[taler-docs] branch master updated (4dfa86c -> 12a3571)

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dold pushed a change to branch master
in repository docs.

    from 4dfa86c  modified reducer documentation
     new d5b6f10  clarify
     new 12a3571  some ideas

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Summary of changes:
 design-documents/009-backup.rst | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/design-documents/009-backup.rst b/design-documents/009-backup.rst
index 7ec8be2..1b4895e 100644
--- a/design-documents/009-backup.rst
+++ b/design-documents/009-backup.rst
@@ -18,7 +18,9 @@ Requirements
     their wallet's root secret safe.
 
 * Arbitrary number of backup providers must be supported
-* Minimize information leaks / timing side channels **if** requested by the 
user
+* Minimize information leaks / timing side channels (user might be able to 
change
+  some setting to allow more frequent backup with less potential data loss but 
more
+  leakage)
 * Minimize potential to lose money or important information
 * Since real-time sync is not supported yet, wallets should have a feature
   where their whole content is "emptied" to another wallet, and the wallet is
@@ -60,6 +62,9 @@ Supported Operations
   The abandoned wallet marks explicitly in its backup blob that it is 
abandoned.
   Abandoning a wallet will set the backup state to "uninitialized".
 * **backup**: Do a backup cycle.
+* **rekey**:  Change to a new wallet root secret, in case the old one has been
+  compromised.  Only protectes future funds of the wallet from being
+  compromised.  Requires a new payment to all configured backup providers.
 
 
 Backup Format
@@ -90,8 +95,8 @@ Open Questions
 * What happens if the same Anastasis user has multiple wallets?  Can Anastasis 
somehow
   support multiple "instances" per application?
 
-Future Work
-===========
+Future Work / Ideas
+===================
 
 * Incremental backups?
 
@@ -100,6 +105,14 @@ Future Work
     be updated incrementally once the journal is full.
   * Leaks more information and is more complex.
 
-* Real-time synchronization, either over some signaling server
+* Mult-device synchronization, with synchronous communication either over some 
signaling server
   or P2P connectivity (WebRTC, etc.)
 
+  * Destroys the "wallet" metaphor, now the wallet is more like an account.
+  * We should first agree on the requirements from the perspective of end users
+  * P2P payments in Taler might also make sync less important
+  * Maybe only parts of the state (purchases / contracts, but not coins) 
should be synchronized?
+  * WhatsApp web model:  The wallet runs only on one devices, but other devices
+    can connect to it as clients.  (Allows my browser wallet to temporarily 
access
+    money from my phone wallet and vice versa.)
+

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