[feature] [lbu] allow file as option for media in revert, list-backup, others
for the mobile use case, it is a bit awkward to plug up a floppy drive or USB drive into as a backup solution. it's a lot easier to ssh into a linux phone to both make backups and restore them while the device is running.
problem is that cmd_revert() and cmd_listbackup() only look for external media to operate on. i even tried to make a filesystem in a file, and tried to force that to work as the media, but even after changing the script to look for the correct mountpoint (which is not set up for this by default,) it still didn't let me do everything, and it's likely to have caused breakage if i went further into it.
please implement backing up a device to an archive on the device, and restoring from that archive. i'm currently dealing with this problem by simply zipping up the entire 32gb device file my OS is installed to, instead of the smaller backup package that lbu offers.
heck, maybe i'm misunderstanding what this util is for, in which case i'd be happy to know an alternative that is actually intended to have this functionality