Now what I'm about to say is not a best practice from a storage management or backup/recovery standpoint, but if...
you're really cost constrained, and since it's such a small amount of data (40GB), it may work for you. You could protect the data simply by copying it regularly to multiple 100 GB+ portable hard drives -- one for each day of the week -- and take them offsite easily due to the small form factor. These portable hard drives are readily available from any consumer electronics store for a few hundred dollars each and some models can store data in an encrypted format for that extra level of security. However, be warned, I again want to emphasize that this is not considered a best practice from a data protection standpoint due to the questionable reliability of portable hard drive technology, security issues such as misplacement of the device and the danger of easily overwriting backed up data, among other issues. Therefore, I provide this idea as a consideration only rather than a recommendation.
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