Is there any maintenance worth doing on an external? Repair disk or permissions?

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I have external hard drives I use for backups and for film editing. Is there any kind of maintenance worth doing for them? Repair disk and/or permissions? Something else? Just curious. Some are bootable and some are not.
 
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On mine I run Onyx and DiskWarrior. When updating my cloning software, that runs Repair Permissions. In short same mainteance as the internal disk. Whether they are bootable will depend if they have an operating system on them. All should be in Disk Utilitywhen connected.
 

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