[taler-docs] branch master updated: expand tombstone explanation

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dold pushed a commit to branch master
in repository docs.

The following commit(s) were added to refs/heads/master by this push:
     new 68e2450  expand tombstone explanation
68e2450 is described below

commit 68e245069a3ba19cd014d9ec82d3b8b6cff7e6a1
Author: Florian Dold <florian@dold.me>
AuthorDate: Mon Apr 26 23:13:52 2021 +0200

    expand tombstone explanation
---
 design-documents/019-wallet-backup-merge.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/design-documents/019-wallet-backup-merge.rst 
b/design-documents/019-wallet-backup-merge.rst
index ceedfb3..3c4541f 100644
--- a/design-documents/019-wallet-backup-merge.rst
+++ b/design-documents/019-wallet-backup-merge.rst
@@ -131,7 +131,9 @@ Q / A
   * A: When syncing with a backup server that still has an old version
     (but same device ID and wallet root pub), the tombstones ensure
     that no old data is re-surfaced that has been deleted in later
-    versions.
+    versions.  This can happen in practice even with only one device,
+    namely when a backup provider is unavailable for a long time,
+    but then becomes available again.
 
 * Q: Why are tombstones only GCed after exceeding an age threshold?
 

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