[X4U] invisible volume and disk space

[alexandre]

hi

i'm going to try and be as precise as possible… here's my problem:

i regularly clone my iMac 2TB hard drive to en external drive, overnight using SuperDuper.

last week, SuperDuper gave me an error, stating it hadn't been able to complete the clone for some obscure reason. as soon as i had closed the application, the system popped up a window saying i have too little harddrive space left. indeed, all of a sudden only 200Mb were available, whereas the evening before i still had roughly 400GB!

this evening i ran GrandPerspective to have an overall view of my drive contents and i'm noticing that it is indexing files on a volume called iMac_Clone_2TB (the name of my external HD, but not connected).

so…using terminal, i've now made all invisible files visible and on the top-level of the HD, there's now a folder called Volumes containing another folder called iMac_Clone_2TB, weighing a whopping 377GB!

i've no idea how it got there, my backup routine being the same for the past year. but for some reason SuperDuper seems to have cloned the drive to the drive being cloned…

my question is: can i delete this folder? if so, how? any precautions needed?

many thanks and best regards, alexandre