I've stopped using physical off-site backups for a number of reasons:
- HDDs are not rugged - Someone needs to physically do work (swap hard drives) - HDDs fail.
I'm now using Super Flexible File Sync to send all my customer's data to Amazon S3. Benefits for me are: - Improved reliability over HDDs with 99.999999999% durability - No-one has to do any physical work - I get e-mailed every day that the backup was successful and what it did, a missing e-mail means I need to check the server - Super Flex is infinitely configurable, I set it to keep 30 file versions and keep 60 days of archive history - Unlike a HDD in a staff member's bag, the backup is secure as it's transferred via SSL & Super Flex password protects the files in Zip.
The increased cost of S3 over a number of delicate HDD is well recouped in the improved flexibility and reliability. Plus they drop the price every 6 months, and if you only need 99.99% durability it's half the price.
The disadvantage is large backup files (such as Exchange databases) which are difficult to transmit.
As for HDDs, I went exclusively Seagate for reputation and ease of purchase. I've since had almost every single Seagate Enterprise drive I installed fail, so I've been swapping them all out for Western Digital.