New Mac, Old Mac, Time Capsule, Old Airport express

Hi,
I have a couple of questions which I should be grateful if someone could answer:
I currently have an "old" mac (latest version of 10.4) and an "old" airport express (latest updates) connected to a modem which forms a basic wireless network with my mac connecting @ 802.11g speed. I also use airtunes.
I am looking at getting a new mac and a time capsule. My intention is to set up a new network with the time capsule as the main base connected to the modem. I only intend to use the backup facility with the new mac.
1.) Can I add the "old" airport express as a client to this network?
2.) If the answer is yes, then clearly the network will have to allow "g" and "n" devices to connect. will doing so mean that the new mac cannot take advantage of the greater speed available with the "n" standard? That is to say will the new mac only ever connect at the g speed?
Also is there the option to "zero" the time capsule hard drive?
Thanks

1.) Can I add the "old" airport express as a client to this network?
Certainly as long as the new Time Capsule is operating in an 802.11g compatible mode. The AirPort Express (AX) will connect wirelessly just like any other client.
2.) If the answer is yes, then clearly the network will have to allow "g" and "n" devices to connect. will doing so mean that the new mac cannot take advantage of the greater speed available with the "n" standard? That is to say will the new mac only ever connect at the g speed?
The 802.11n connection with the new Mac will take a speed hit whenever the old AX or old Mac are connected via 802.11g. The amount of the hit will depend on the amount of 802.11g activity.

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