The SSD will give you faster I/O and can lead to a huge performance jump.
If you dont need more than 960 GB I would take the 960 GB Drive.
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SSD is the way to go if you don't care about the data. Although RAID10 is always nice. If you don't care about I/O, go with RAID10.
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About the activity on the VPS - they will be used mainly for running scripts. These scripts can easily be resumed should the harddrive fail, nothing will be lost except for the time it takes to set them up.
RAID 10 4 x 1TB would be your best bet unless your doing a ton of random I/O if your just running some scripts in most cases you will be fine. However, if your comfortable with the downtime in the event of a single drive failure single drive should work.
Another option for you depending on what your actual storage needs are would be go with 1 x SSD with 1 x 1TB SATA and use that for backup storage of the vps. This way you can have the best of both worlds for a low cost. Running OpenVZ if your running linux you can backup the containers on whatever basis you want then if you have primary drive failure you can just restore them to the newly replaced SSD.
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