If you have chosen to use the new recommended exclude rule to exclude the /plugins folder from being checked by AutoRestore/Quarantine then you do not need to do anything and can just install the BackupBuddy plugin.
If you have not chosen to exclude the /plugins folder from being checked by AutoRestore/Quarantine then you would need to do the standard ARQ Procedural steps when installing a new Plugin.
Source: http://forum.ait-pro.com/forums/topic/read-me-first-pro/#autorestore-quarantine
AutoRestore/Quarantine (ARQ Infinity) is a real time file monitor that monitors all of your website files for any changes.
When updating plugins, installing new plugins, deleting plugins or updating, installing and deleting themes follow these simple procedural steps for AutoRestore/Quarantine (ARQ).
1. Turn off ARQ
2. Install / update / upgrade plugins or themes
3. Click the 4 Backup Files buttons (you actually ONLY need to click the wp-content Backup Files button – when in doubt click all 4 Backup Files buttons)
4. Turn ARQ back On.
If you would like to know how to exclude the /plugins folder from being checked by AutoRestore/Quarantine please watch the BulletProof Security Pro setup video tutorial.
http://www.ait-pro.com/aitpro-blog/2841/bulletproof-security-pro/bulletproof-security-pro-overview-video-tutorial/
or this Forum Topic has step by step instructions on excluding the /plugins folder from being checked by AutoRestore/Quarantine.
http://forum.ait-pro.com/forums/topic/autorestore-quarantine-exclude-plugins-folder-and-themes-folder/
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