https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_calls_list
You want the command "backup"
BTC, FTC, WDC, DGC, DVC and MNC, lol. All using the -qt versions as far as I know.
Here's another question regarding that...
We only have to do backups when SENDING funds, right? So we can keep receiving all month long but if nothing was sent out, backing up over and over isn't necessary?
They recommend backing up every 100 transactions, cause that is how big the key pool is, so you can make that bigger, and then go longer without a backup.
Got ya. So the transactions only means outgoing, right? Ex. if there was 1 outgoing transaction but 500 incoming, that would still just be 1 out of the 100? (Assuming you aren't creating new incoming addresses for specific things, I mean)
I would say yes cause of change addresses.