USB 2.0 Transfer Speeds
The ioSafe Solo has USB 2.0 interface, which has a data transfer rate of up to 480Mbps.
In the real world a:-
6.7GB folder containing 303 files (in 55 sub folders) was transferred in 7 min and 36 seconds.
2.8GB compressed image of the Windows 7 DVD took 4 min and 8 seconds.
784MB folder containing 24,184 files (in 788 sub folders) took 6 min 20 seconds.
Full computer backup (30GB) with compression and verification takes 1 hour and 21 mins.
In short USB 2.0 will be fast enough for a typical user.
The question is do you need a USB 3.0, eSata, Firewire or Thunderbolt connection?
Today most computers have several USB 2.0 ports and very few computers have USB 3.0 or eSata ports and only the latest Macs have thunderbolt connections.
Unless you have a specific need for higher transfer rates, the USB 2.0 interface will be fine.
The ioSafe Solo range has a USB 2.0 interface with will be fast enough for most users, especially if it used as a backup or archive device.
Most backups are scheduled to run overnight which means that the transfer speed of the device is less relevant, as long as the backup can be completed after hours.