If you just want to store them for backup, take a look to Amazon Glacier, which is cheaper than S3.

You are already into crypto, so you could also take a look to Sia, but it requires you to keep your node on sync and run it the same week contracts expire. It is counter-productive, however, as you need to download the blockchain -more than 10 gigabytes- in order to save you the space of the files you want to backup. But I don't know the size of all those files, so maybe it could serve your needs.

I would go with Glacier.

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