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Just out of interest and because you might know. How do the cloud services ensure they don't suffer data loss?
Airhead-
What salad said.
Except moar.
They do have backups, and backups of backups (because the backups are also on their storage so get backed up). And they have replication even without backups, so live data exists in multiple places on multiple servers in multiple datacentres.
There are abstractions on abstractions that help answer a simple question like: Where is this file, can I get it please? And this gets mightily complex when you introduce caching and all of the places a file may additionally exist in addition to the replicated storage, backups and backups of backups.
To say that there are at minimum 3 copies of a file is to underestimate how many times a file exists, and just how much of an outage can really make the file unavailable.
Storage and systems are no longer the worry for such companies, it's networking and the "ooops, a minor outage has caused a domino effect of outages because we accidentally sent all of the network traffic to some small rack of servers".
The problems may on the surface look similar between a home user and a cloud company... but different parts of the problem are solved for the cloud company and the problem is very different. There's virtually nothing a cloud company is doing that you could apply at home, i.e. how many multiple servers and networks do you have? Are they even in different physical locations?
Velocio
I've run replication across 2 NAS's but as I say, it's for redundancy of data availability rather than a bombproof backup.
Imagine the following scenarios:
Which of these would replication to a second NAS solve?
Additionally, NAS2 is equally likely to fail, giving you a false sense of security about your data integrity.
If you think the internet is a passing fad or have very sensitive data then backup to cold storage, in a fireproof safe, ideally offsite. Otherwise backup to a reliable cloud subscription service. There are lots