Backup Storage Devices

I'm thinking of getting either a microdrive or flashdrive for backing up data. The extra storage of a microdrive would be nice, but I'm concerend about reliability. And just how reliable are flashdrives? Any advice would be great.

I wouldn't use that for backups; it's not cost-effective... You don't really need to pay for a random access long-term storage device for backups. Taiyo Yuden DVD+Rs should do fine.