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Having just done so, I can most definitely say you can back up/dump the NVRAM via GPIB, and supposedly reload it too. Certainly it's not a substitute for a re-calibration if the NVRAM goes bad, but for the home hobbyist it's more often than not "good enough" even if it's a couple years out of date. And it's good insurance when you are poking around inside your scope.

There's an EEVblog thread on the topic of dumping calibration for the 2400 series. I have a printout in the back of my SM, but lost the URL.

After you've connected via GPIB:

-Unblock the commands by sending "KEY 0"

-Dump your data with "EAROM? <addr>" where addr is 0...255
you can do a csv list, e.g. EAROM? 0,1,2,3, but one at a time is a little more convenient for reasons that will become apparent.
- The scope will reply with "EAR <addr>:<value>" (list of items if multiple addresses). Value is decimal. For example: "EAR 0:1279"

- Writing values back is done with "EAROM <addr>:<value>". Apparently multiple values on one line does not work, so if you have individual lines from the above, it's far easier to parse and load back in.

There's also a comment in the thread musing about a way to possibly enter values directly on the scope via Exerciser 2. I'd not be surprised if this was the case with a magic key sequence, as the EAROM? query alters the pointer for the exerciser. For example, if I open EXER 2 to 0x00 and then do an EAROM? 32 query, and then push the address +1 key, the shown address jumps to 0x21.

I bought a cheap PCI GPIB card off ebay for a couple Hamiltons.