Using zstd for fast XFS dumps

# Dumps using zstd, with up to 32 threads.
# To silence zstd, add -q

# xfsdump -L mybackup -J - / | zstd -3 --threads=0 -o /backups/mybackup.zstd

xfsdump options (https://man.archlinux.org/man/xfsdump.8.en):
# -L session_label: Specifies a label for the dump session. It can be any arbitrary string up to 255 characters long.
# -J Inhibits the normal update of the inventory. This is useful when the media being dumped to will be discarded or overwritten.
# - sends output to stdout, for zstd to read
# / the partition directory

zstd options (https://man.archlinux.org/man/zstd.1.en):
# -3 the level of compression, from 1-22. 3 is the default.
# --threads=0 use all threads. 0 means "all threads". This is the magic, as ti uses all your CPU to compress.
# -o the backup location