Ideas for a nearly 100% reliable portable data storage

If 10 GB capacity is sufficient, then a 16 GB USB flash drive is the best solution in terms of robustness and reliability. A (synchronized) second stick, however, will double your chances to get your data home safely. :)

Have to wonder - why so much of your equipment is dying - environmental? Electrical(surge?) accident (drops?) or other? Your solution would have to incorporate protection against this.

Also, have you considered a remote solution - RDP into a system at home or possibly keeping things on the cloud? There are things like Microsoft Live Mesh.

Don't go with physical storage. Backup your data with Dropbox or to a server that is managed. Online space is pretty cheap, and you have full redundancy if they do daily backups.

If 10 gig is enough (and yeah, shouldn't it be?), borrow my procedure if you see fit : - 8 gig with all that data on USB-stick, hash and double/triple-check at will; one kept at each parent's house (this is of course something one has to re-adjust as one sees fit, in case no-one is to be trusted, two separate bank vaults would be my guess...hardcore though...)

Be ultra-prudent (parents do not live in same town as me, or each other (again....adjust as see fit))
and rigorous in regards to the what and the when and the where, stick to it; and you've got something that's kept me (a klutz of dimensions) knowing that my that is safe...

("that" seems to imply something....exchange with "my digital personification" or what-not...)