if you want to mannualy archive then go these setting..
Click File > Info > Cleanup Tools > Archive.
Click the Archive this folder and all subfolders option, and choose the folder you want to archive.
Under Archive items older than, enter a date.
You can create multiple .pst files if you want to archive some folders using different settings. For example, you may want to keep items in your Sent folder longer than items in your Inbox folder.
Check the Include items with “Do not AutoArchive” checked box to archive individual items that are excluded from automatic archiving. This option doesn't remove that exclusion from these items, but instead ignores the Do not AutoArchive setting for this archive only.
if you want to Turn off AutoArchive-
Click File > Options > Advanced.
Under AutoArchive, click AutoArchive Settings.
Uncheck the Run AutoArchive every n days box.
Finally click ok. now your mails are going to archive.