method SetSnapshot config-name number description cleanup userdata
method CreateSingleSnapshot config-name description cleanup userdata -> number
-method CreatePreSnapshot config-name pre-number description cleanup userdata -> number
-method CreatePostSnapshot config-name description cleanup userdata -> number
+method CreatePreSnapshot config-name description cleanup userdata -> number
+method CreatePostSnapshot config-name pre-number description cleanup userdata -> number
method ModifySnapshot config-name number description cleanup userdata
method DeleteSnapshots config-name list(numbers)