Archived data is any data that has been deleted from your local drive but is still stored in your ReadyNAS Vault account.
For example, let's say you schedule a daily automated backup job for your "My Documents" folder. The backup runs according to schedule on 3/14 at 3:00 pm and backup files/folders inside it.
On 3/15 at 8:00 am, you delete five files from your "My Documents" folder on your local machine. If your settings are such that your backup job retains any files that have been deleted locally from your computer, your ReadyNAS Vault account will continue to store these five files and these five files will be marked as "Archived" data.
Change Archiving Settings:
Archived files can be retained for any number of days. To change how long to retain archived files for, see "Setting Archiving Rules".