Merge branch...

Merge branch '6270-snapshot-enhancement-in-order-to-provide-a-first-concept-of-revision-and-source-reference' into '1.4-dev'

Resolve "[Snapshot] - Enhancement in order to provide a first concept of revision and source reference"

Closes #6270

See merge request fusiondirectory/fd!1034

include/management/snapshot/class_SnapshotHandler.inc

@@ -304,7 +304,7 @@ class SnapshotHandler
     }
 
     // calculate the epoch date on which snaps can be delete.
-    if ($snapRetentionDays !== 1) {
+    if ($snapRetentionDays !== -1) {
       $todayMinusRetention = time() - ($snapRetentionDays * 24 * 60 * 60);
       $snapDateToDelete = strtotime(date('Y-m-d H:i:s', $todayMinusRetention));