delete old docs (#327)

* delete old docs

* new docs

docs/pages/location/options/copy.md

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+# Copy
+
+Instead of specifying multiple `to` backends for a given `location` you can also use the `copy` option. Instead of recalculating the backup multiple times, you can copy the freshly copied snapshot from one backend to the other, avoiding recomputation.
+
+###### Example
+
+```yaml | .autorestic.yml
+locations:
+  my-location:
+    from: /data
+    to:
+      - a #Fast
+      - b #Fast
+      - c #Slow
+```
+
+Becomes
+
+```yaml | .autorestic.yml
+locations:
+  my-location:
+    from: /data
+    to:
+      - a
+      - b
+    copy:
+      a:
+        - c
+```
+
+Instead of backing up to each backend separately, you can choose that the snapshot created to `a` will be copied over to `c`, avoiding heavy computation on `c`.