Symantec Drive Encryption for home PC-s.

I have two computers which have some personal data on them.

I use them also for business, since I move around a lot.

Both of them are Windows 7, one ise 32 and other is 64 bit system.

I want to encrypt the whole harddrive, also I want to encrypt my USB disk which I use for backup.

My main question is, if my computers fail, how will I be able to read the encrypted USB backup disks on another machine?

Or If i want to take only the drive with me, to my business partner, how will I be able to copy data from my USB disk to his machine?

Thank you for your reply.