Archiving will run based on the site or task schedule set up for your mailbox, or you can right click the task and do a run now
to perform an unarchive, you can go to the Vault Admin Console and right click Archives and go to Export Archive Wizard to where you can export everything to its original location in the maiilbox (you could if you want also do specific folders and have EV delete the items from the archive once the restore has complete)
Or you can go in to the mailbox itself with the EV Client and if you have the desktop policy set appropriately, manually restore items by selecting multiple items and do a restore from vault
however there is no way to schedule the unarchive process, it is all manual
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