I am slowly migrating my work stuff from my PC laptop to my RMPB (16GB, 256GB SSD). The limiting SSD space is a constraint that will require a little trial and error to get right (archive vs active, work vs personal). I also plan to use Time Machine for backing-up my stuff to external USB 3.0 drive(s). Just a few quick Qs: 1. Can I backup just a subset of data/folders using TM? 2. Can I commingle a TM backup and my manually archived files on the same VOLUME, or should I create a dedicated partition for TM? 3. How does TM handle infrequent attachment of the external drive? 4. Will TM be able to distinguish the correct external drive from among many? Example "Work" archive drive (large client databases, etc.) separate from my "Personal" archive drive (LR4 photos, music, etc.) - I do not want to carry personal stuff while I travel for work, but I DO need to carry my Work archive. 5. The manual external archive files SHOULD also be back-up to yet another external drive. Any suggestions for drive-to-drive back-up & sync? Thanks!