qsnap is a simple snapshot tool for BtrFS. It assumes that all subvolumes are
present in a certain directory (default /mnt/root, which is in fact my BtrFS
root (subvol 5)) and places snapshots next to them in a directory called
${subvolume_name}.snapshots. Snapshots always have a name like
2015-03-07T17:09+0100 (produced by date -Im), which is the time the snapshot
was created. They are placed in a hierarchy of directories representing the
time of the snapshot, e.g. home.snapshots/2015/03/07/2015-03-07T17:09+0100.
qsnap ${subvolume_name}. To enable automatic snapshots (defaults to daily),
systemctl enable qsnap@${subvolume_name}.timer.
# make install
You can specify a prefix and a destination directory (for
distributors/packagers): make prefix=/usr DESTDIR=/tmp/package/image.
Edit /etc/qsnap.conf and change $ROOT accordingly (defaults to /mnt/root).
To change the time a snapshot is automatically created, create a file ending in
.conf in /etc/systemd/system/qsnap@.timer.d (or
qsnap@${subvolume_name}.timer.d to limit to a certain subvolume) with a
content similar to this:
[Timer]
OnCalendar=
Oncalendar=weeklySee
systemd.timer(5)
for details.