Yes, you can save your .comiclife file from iOS to your Dropbox folder. You will need to have the Dropbox app installed on your device.
To export your comic into your Dropbox account, do the following:
From the "Collections" view:
Tap on the desired comic > then tap Action icon (square with arrow pointing up) > Open in Another App > Comic > Choose App > Open in Dropbox.
From whilst in editing mode of comic:
Tap on the Tools icon (spanner top right corner) > Share and Print > Open in Another App > Comic > Choose App > Open in Dropbox.