can I test that my 24 word seed is still ok?
Your seed is a random combination of data that, when produced, will re-produce your wallet, indefinitely.
To see if it's working you can just create a new folder, copy and paste the 'simplewallet' file into that folder. Then execute a script with the simplewallet file but with the flag --restore-deterministic-wallet
It will ask you for a 'new' name for your wallet, a 'new' password, and then the seed.
The new name/pw don't have to be the same as the old one, but it will make a file that is the same wallet regardless of what you choose. You may verify the address/viewkey/tx log independently from there if you wish to go that far.
Check out the
missives for a confirmation/better description.
edit: There's no need to worry about moving any files. You may shred them, burn your computer, just lose the password to your wallet file .. etc. As long as you know those words you may restore your wallet no matter what happens.