Renew asciinema/screencasts (backport)

docs/misc/asciinema/advanced.sh

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+# For the pro users, here are some advanced features of borg, so you can impress your friends. ;)
+# Note: This screencast was made with borg version 1.1.0 – older or newer borg versions may behave differently.
+
+# First of all, we can use several environment variables for borg.
+# E.g. we do not want to type in our repo path and password again and again…
+export BORG_REPO='/media/backup/borgdemo'
+export BORG_PASSPHRASE='1234'
+# Problem solved, borg will use this automatically… :)
+# We'll use this right away…
+
+## ADVANCED CREATION ##
+
+# We can also use some placeholders in our archive name…
+borg create --stats --progress --compression lz4 ::{user}-{now} Wallpaper
+# Notice the backup name.
+
+# And we can put completely different data, with different backup settings, in our backup. It will be deduplicated, anyway:
+borg create --stats --progress --compression zlib,6 --exclude ~/Downloads/big ::{user}-{now} ~/Downloads
+
+# Or let's backup a device via STDIN.
+sudo dd if=/dev/loop0 bs=10M | borg create --progress --stats ::specialbackup -
+
+# Let's continue with some simple things:
+## USEFUL COMMANDS ##
+# You can show some information about an archive. You can even do it without needing to specify the archive name:
+borg info :: --last 1
+
+# So let's rename our last archive:
+borg rename ::specialbackup backup-block-device
+<up>
+borg info :: --last 1
+
+# A very important step if you choose keyfile mode (where the keyfile is only saved locally) is to export your keyfile and possibly print it, etc.
+borg key export :: --qr-code file.html # this creates a nice HTML, but when you want something simpler…
+< remove comment >
+< let there: borg check > --paper # this is a "manual input"-only backup (but it is also included in the --qr-code option)
+
+## MAINTENANCE ##
+# Sometimes backups get broken or we want a regular "checkup" that everything is okay…
+borg check -v ::
+
+# Next problem: Usually you do not have infinite disk space. So you may need to prune your archive…
+# You can tune this in every detail. See the docs for details. Here only a simple example:
+borg prune --list --keep-last 1 --dry-run
+# When actually executing it in a script, you have to use it without the --dry-run option, of course.
+
+## RESTORE ##
+
+# When you want to see the diff between two archives use this command.
+# E.g. what happened between the first two backups?
+borg diff ::backup1 backup2
+# Ah, we added a file, right…
+
+# There are also other ways to extract the data.
+# E.g. as a tar archive.
+borg export-tar --progress ::backup2 backup.tar.gz
+ls -l
+
+# You can mount an archive or even the whole repository:
+mkdir /tmp/mount
+borg mount :: /tmp/mount
+ls -la /tmp/mount
+borg umount /tmp/mount
+
+# That's it, but of course there is more to explore, so have a look at the docs.