Airport extreme or Time Capsule

hi,

main backup destination (cracked dlink dns323 nas) getting strange lots of input/output errors randomly deleting own root/.ssh folders etc.
need solution soon.

network sits following devices:
1 macbook pro
1 macbook white
2 iphone 4
2 airport express
1 appletv 2
1 nas wired netgear router.

should airport extreme usb disc or time capsule?

thanks!

 

synology nas, problem fixed.

 

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