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Good external drive for backups, but rarely used.

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I'm looking to buy an external (usb) drive to store some backups once in a while, but actually use rarely (perhaps weekly to monthly to store a backup, hopefully never or only once to recover one).

I only need it for fairly critical data so it need not be very large (100 GB woud suffice, 200 would be nice).

What do you guys think would be a good choice here? I could get a standard 2.5" harddisk in an enclosure with plenty of space quite cheaply. I could also get a 128 Gb SSD external drive for a reasonable but higher price.

I wonder if the SSD would be more reliable if i left it unused for a long period of time. I've had 2.5" spinning external drives give me problems in the past: At times i left them for a few months after which i tried to access them again and they no longer worked. Mostly this came up when i wanted to create and additional backup, not recover, so it has not caused major problems but still is a bad thing.

I do have multiple online backup solutions so it's not mission critical that this works 100% of the time, but i wonder what would fare better over a period of several years with irregular use: ssd or hdd.

Also i want to store the data on these drives in truecrypt containers/partitions so that there is no problem if they are even stolen or lost. I'm not sure to what degree that factors in to things, but perhaps it's important.

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