A word about FAM (Freelancer Account Manager) :
The accounts created by it can
NOT SAVED AS HARDCOPY/PRINTOUT/WRITTEN DOWN !!!
FAM doesn't create a "true" account number that can be recognized by FLID Changer for example. "Account code" or "Signature" of FAM are NOT the "true" account numbers.
To secure them you have - best regulary - save/store them somewhere they can't get lost (USB-stick or alike)
Open FAM - click "Export" - select a folder or create one (i.e. "saved FAM account" or similar) whereever you want -
give it a name (i.e. FAM accounts 08.01.2015 or similar) - click "save"
Then you have a xxx.ADF file there, that can be "imported" again.
edit :
This counts for FAM 1.0
I didn't try FAM-ng yet, might be different.