Manage btrfs snapshots

Question

One of the feature that i much like about btrfs is Snapshot.
What i want to do is to create snapshots of /home every 5/15 minutes (i have to test better the impact on performance) and retain:
02 - Yearly snapshots
12 - Monthly snapshots
16 - Weekly snapshots
28 - Daily snapshots
48 - Hourly snapshots
60 - Minutely snapshots
The above scheme is indicative and i'm looking for suggestion in order to improve  it.
After long google searching finally i've found a very simple but powerful bash script to manage btrfs snapshots: https://github.com/mmehnert/btrfs-snapshot-rotation
I've changed a bit the script in order to use my naming scheme
#!/bin/bash
# Parse arguments:
SOURCE=$1
TARGET=$2
SNAP=$3
COUNT=$4
QUIET=$5
# Function to display usage:
usage() {
scriptname=`/usr/bin/basename $0`
cat <<EOF
$scriptname: Take and rotate snapshots on a btrfs file system
Usage:
$scriptname source target snap_name count [-q]
source: path to make snaphost of
target: snapshot directory
snap_name: Base name for snapshots, to be appended to
date "+%F--%H-%M-%S"
count: Number of snapshots in the timestamp-@snap_name format to
keep at one time for a given snap_name.
[-q]: Be quiet.
Example for crontab:
15,30,45 * * * * root /usr/local/bin/btrfs-snapshot /home /home/__snapshots quarterly 4 -q
0 * * * * root /usr/local/bin/btrfs-snapshot /home /home/__snapshots hourly 8 -q
Example for anacrontab:
1 10 daily_snap /usr/local/bin/btrfs-snapshot /home /home/__snapshots daily 8
7 30 weekly_snap /usr/local/bin/btrfs-snapshot /home /home/__snapsnots weekly 5
@monthly 90 monthly_snap /usr/local/bin/btrfs-snapshot /home /home/__snapshots monthly 3
EOF
exit
# Basic argument checks:
if [ -z $COUNT ] ; then
echo "COUNT is not provided."
usage
fi
if [ ! -z $6 ] ; then
echo "Too many options."
usage
fi
if [ -n "$QUIET" ] && [ "x$QUIET" != "x-q" ] ; then
echo "Option 4 is either -q or empty. Given: \"$QUIET\""
usage
fi
# $max_snap is the highest number of snapshots that will be kept for $SNAP.
max_snap=$(($COUNT -1))
# $time_stamp is the date of snapshots
time_stamp=`date "+%F_%H-%M"`
# Clean up older snapshots:
for i in `ls $TARGET|sort |grep ${SNAP}|head -n -${max_snap}`; do
cmd="btrfs subvolume delete $TARGET/$i"
if [ -z $QUIET ]; then
echo $cmd
fi
$cmd >/dev/null
done
# Create new snapshot:
cmd="btrfs subvolume snapshot $SOURCE $TARGET/"${SNAP}-$time_stamp""
if [ -z $QUIET ]; then
echo $cmd
fi
$cmd >/dev/null
I use fcontab
[root@kabuky ~]# fcrontab -l
17:32:58 listing root's fcrontab
@ 5 /usr/local/bin/btrfs-snapshot /home /home/__snapshots minutely 60 -q
@ 1h /usr/local/bin/btrfs-snapshot /home /home/__snapshots hourly 48 -q
@ 1d /usr/local/bin/btrfs-snapshot /home /home/__snapshots daily 28 -q
@ 1w /usr/local/bin/btrfs-snapshot /home /home/__snapshots weekly 16 -q
@ 1m /usr/local/bin/btrfs-snapshot /home /home/__snapshots monthly 12 -q
And this is what i get
[root@kabuky ~]# ls /home/__snapshots
[root@kabuky ~]# ls -l /home/__snapshots
total 0
drwxr-xr-x 1 root root 30 Jul 15 19:00 hourly-2011-10-31_17-00
drwxr-xr-x 1 root root 30 Jul 15 19:00 hourly-2011-10-31_17-44
drwxr-xr-x 1 root root 30 Jul 15 19:00 minutely-2011-10-31_17-18
drwxr-xr-x 1 root root 30 Jul 15 19:00 minutely-2011-10-31_17-20
drwxr-xr-x 1 root root 30 Jul 15 19:00 minutely-2011-10-31_17-22
drwxr-xr-x 1 root root 30 Jul 15 19:00 minutely-2011-10-31_17-24
drwxr-xr-x 1 root root 30 Jul 15 19:00 minutely-2011-10-31_17-26
drwxr-xr-x 1 root root 30 Jul 15 19:00 minutely-2011-10-31_17-32
drwxr-xr-x 1 root root 30 Jul 15 19:00 minutely-2011-10-31_17-37
drwxr-xr-x 1 root root 30 Jul 15 19:00 minutely-2011-10-31_17-42

Answer 1

tavianator wrote:
Cool, I just wasn't sure if the "And this is what i get" was what you were expecting.
Looks good, I may take a look since I'm using btrfs.  Don't confuse this for a backup though .
Sorry for confusion, my english is not very good
Yes this is not a backup.
It's a sort of parachute if you do something stupid with your files you can at any time come back