Proposed feature to address https://labs.riseup.net/code/issues/2492

handlers/dup.helper.in

@@ -426,6 +426,13 @@ increments = $dup_increments
 #keep = yes
 keep = $dup_keep
 
+# for how many full backups do we keep their later increments ;
+# default is 6.
+# increments for older full backups will be deleted : only the more
+# recent ones will be kept
+#keepincrofulls = 6
+keepincrofulls = $dup_keepincroffulls
+
 # for how many full backups do we keep their later increments ;
 # default is all (keep all increments).
 # increments for older full backups will be deleted : only the more