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Secure Backup to external HDD
I want to set up an external HDD, connected to a wireless hub, to be used for backup. This hub is used by 2 or 3 people during the week, and I want to set up automatic backup for each of them to the HDD.
Because the HDD will be in a semi-public area, it wll be relatively easy for it to to pinched. While there is not much I can do about that, what i would like to do is to encrypt the backed up data.
What i want to be able to do is to establish the HDD as encrypted, and somehow register the machines to it such that a password is not needed every time they need to back up. If the users need to do this, they will not carry out the backup, and I want them to do this.
I suspect that a NAS drive will provide this functionality but this is a very expensive solution, and my reading of WD and Seagate products SEEMS to imply that their encryption requires a password every time user wishes to access the drive for backup etc.
Is there some software that I can install on the machines to give me NAS-like functionaity (that is log in in the background), or are there any easily available USB connected HDD that I ca buy that will not break the bank.
Thanks in anticipation