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Tibalt Talcott
I already know how to access compressed image without extracting it first (AVFS), so I just need to mount the dd image. The problem is I have no extra space available, as the smaller drive is almost full (7 GB free), so cat-ing archive chunks together is not an option.
Is there any way to cat archive chunks on the fly, so I can mount the image that's inside the archive? I have found this solution, but I guess AVFS will need to seek the file. Or maybe there's some simplier solution?
There is seek-bzip ( -bzip ) and similar projects which attempt to provide random block access to bzip2 archives. Creating the table for that will take about as long as uncompressing the entire thing; actual I/O will require the correct block to be found, uncompressed and held in memory, and if it's needed again later on, uncompressed again. I currently do not know of any way to employ that solution to your problem directly, though.
You should be using partclone - that's the default, and usually if you installed clonezilla you also have that one installed. (Also, it's apparently better than ntfsclone even for NTFS.) But as you create your image, pay attention to what gets invoked. If you're done, have a look at the log files /var/log/clonezilla.log and /var/log/partclone.log to double-check.