Uggg.... (Gritting my teeth). This might be more difficult that it seems.
Yes, most simple consumer NAS devices use a variant if Linux.
Yes, most simple consumer NAS devices have their own controller to configure the multiple drives in a RAID array.
However you cannot rule out software RAID and do not always assume that they are configured in a RAID 5 array. I have seen some setup multiple drives in JBOD which makes it kinda hard because the disks maybe dynamic, or RAID 0, which you all know is almost impossible to recover.
Normally recovering a RAID 0 will result in extremly fragmented files, but a RAID 5 can result in the same.
I have never used Active Undelete. I have used RAID reconstructor before but never had to much luck with it. I think most consumer level data recovery programs are pretty basic.
I think blackduck30 advise is on onpar.
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It is not essential to have them setup as a raid 5 to recover the data, you can do one disk at a time by rights and then work your way through all 4 drives. The important thing will be retrieving each disks information intact and uncorrupted and then making sure they are reinserted in order.
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But being you have 700 Gigs could take more time than it is worth.
I don't like to toot my opinion but this is one of the reasons I do not like consumer grade NAS devices. Everything is proprietary and data recovery is almost impossible. I have seen this pleanty of times with Netgear, Calvary, etc.. I found it much safer and easier to build one out of an old WinXP box loaded with a bunch of drives. You don't need a monitor or keyboard as you can alway remote into it.