i suppose this netbook u've got is Aspire One D250. it can
support a max of 2GB of RAM, but just on a single memory module.
the best memory module would be of DDR2-667, and it costs around
$35 to $40 to buy one @ Sim Lim. and yup, the netbook RAM are the
same as notebook RAM, SO-DIMM type.
now regarding making a recovery disc. you'll need a external
CD/DVD Drive, since there is no optical drive available on this
netbook. can also get @ Sim Lim, for above $100. this i'm not very
sure, MyPillowTalks could answer more about this. (i've never
done any single backup in my life before...
)