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OWC Drive Dock for backup drives or extra storage.
USB 3.1 about $75
Thunderbolt 2 + USB about $240
Using High Capacity Drives as Single Large RAID-4 / RAID-5 Volume
See the topology overview which discusses general considerations in using four or five or more large hard drives.
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Example: one large RAID-4 volume using four 8TB drives
Four drives in an OWC Thunderbay 4.
This configuration is done with a single OWC Thunderbay 4; it is how OWC supplies the unit pre-configured (though it may be functionally equivalent RAID-5 instead of RAID-4). However, it is implicit that additional drives/storage are needed for nearline and offsite backup.
One huge volume is appealing, but a key issue with one huge volume is backup: MPG advises single-drive backups (non RAID when feasible), which means 8TB (or later 10TB) single drives. A 24TB volume that heads north of 10TB cannot be backed up without an additional 24TB volume (preferably 2 or 3 others for safety!).
Since backing up a 24TB volume requires other 24TB volumes* (preferably three others for robustness and never only one backup!), it can be an expensive proposition with lower redundancy than the multi-volume approach. Plan ahead. See the multi-volume example for an alternate and more flexible approach.
Another issue with one huge volume is organization of files and capacity scaling. Both issues are more manageable with a multi-volume approach, at least if the budget is not open-ended.
* The minimum number of backups is two, and preferably three, such as one nearline (always there for daily backups) and two others stored offsite but regularly updated. Hence using a 24TB master storage volume really requires 2 or 3 more backups of 24TB each, a costly proposition.
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