Observations

Volume identification

Volumes are not numbered, instead they are identified by a unique identifier. For now it is their filesystem volume serial number. This means you never need to process the volumes in any order, nor when you update them.

For instance, suppose you remove some huge files from your filesystem (who would want to see THAT tv-show again!?). As a consequence the backupstatus report shows that a volume contains now 300GB of removable files. You could choose this volume for your next processDrive: useless content will be dropped, making room and using it for fresh file backups.

Volume content

Files are not backed-up in any order. The system just aims to have each file backed-up in a (single) volume. This means content is more or less randomly divided among volumes.