Windows 2012 R2 Backup -- EXTERNAL hard drive recommendations ?

I setup a new server in my
domain and want to change my
BackupExec 2015 task from LTO-4
tapes to EXTERNAL hard drives
 ** 1am = incremental nightly backup
 ** 5pm = I take offsite, plugging
          in a 2nd hard drive for
          the next 1am backup

Do you have any EXTERNAL hard drives
recommendations since I need something
that will be reliable and can be
overwritten 50+ times/year ?
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Get a USB dock, and then normal internal desktop HD's you can drop into that dock. That is the cheapest and still very reliable. Something like this:

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Don S.Commented:
Moving a HDD every day does not lend it's self to reliability for any HDD.  A think to think about - an Incremental backup is worthless without the associate full and intervening incremental (depending on weather it is an increment from the last full or an increment from the last increment) backups.  Spreading incrementals and fulls out over several different drives increases your chances of not having a usable backup when you need it.  Just something to think about.
depending on what you can spend, you can consider enterprise drives, here a nice comparison with user grade ones :

here some seagate drives :
Enterprise class disks don't make any sense for backing up to. They are built to run in high performance RAID arrays 24/7. Backups happen only occasionally and for that you don't need anything high performance or high grade. Any disk should last much longer than the 50+ overwrites an year the asker needs, even 2nd hand disks are more than adequate for the job.

Besides that,all disks will break sooner or later, enterprise class and consumer class disks, and that can happen when they are still new, or later. When that happens has nothing to do with the class of the disk, enterprise class disks just have longer warranty usually, but that is only for the hardware costs, not for the data on them.
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