snapper-configs — Configuration files for snapper configs
The following is a list of variables that can be present in the configuration file. Boolean values must be "yes" or "no".
SUBVOLUME=path
Path of the subvolume or mount point.
There is no default value. The value must always be specified.
FSTYPE=value
Filesystem type for the subvolume.
Default value is "btrfs" but it's recommended to always specify the filesystem type.
QGROUP=qgroup
The btrfs quota group used for space aware cleanup algorithms.
Only supported for btrfs.
SPACE_LIMIT=float or
size
Limit of the filesystems space the snapshots should use. Either a fraction of the whole filesystem for an absolute value. An absolute value must use the C locale.
Only supported for btrfs.
Default value is "0.5".
New in version 0.3.0, absolute value new in version 0.9.0.
FREE_LIMIT=float or
size
Limit of the filesystem space that should be free. Either a fraction of the whole filesystem for an absolute value. An absolute value must use the C locale.
Only supported for btrfs.
Default value is "0.2".
New in version 0.8.0, absolute value new in version 0.9.0.
ALLOW_USERS=users
List of users allowed to operate with the config. The user-names must be separated by spaces. Spaces in usernames can be escaped with a "\".
Also see the PERMISSIONS section in snapper(8).
Using network users should be avoided since it can break most commands including rollback when the network does not work.
Default value is "" but "root" is always implicitly included.
ALLOW_GROUPS=groups
List of groups allowed to operate with the config. The group-names must be separated by spaces. Spaces in group-names can be escaped with a "\".
Also see the PERMISSIONS section in snapper(8).
Using network groups should be avoided since it can break most commands including rollback when the network does not work.
Default value is "".
SYNC_ACL=boolean
Defines whether snapper will sync the users and groups from
ALLOW_USERS and ALLOW_GROUPS to the ACL of the .snapshots
directory.
Also see the PERMISSIONS section in snapper(8).
Default value is "no".
New in version 0.2.0.
BACKGROUND_COMPARISON=boolean
Defines whether pre and post snapshots should be compared in the background after creation.
Default value is "yes".
COMPRESSION=algorithm
Defines the compression algorithm used for saving file list. Allowed values are "none" and "gzip". Depending on the installed libraries, some compression algorithms might not be available.
Default value is "gzip".
New in version 0.10.1.
NUMBER_CLEANUP=boolean
Defines whether the number cleanup algorithm should be run for the config.
Default value is "no".
NUMBER_MIN_AGE=seconds
Minimal age for snapshots to be deleted by the number cleanup algorithm.
Default value is "3600".
NUMBER_LIMIT=number or
range
Defines how many snapshots the number cleanup algorithm should keep. The youngest snapshots will be kept.
Default value is "50".
NUMBER_LIMIT_IMPORTANT=number or
range
Defines how many important snapshots the number cleanup algorithm should keep. Important snapshots have important=yes in the userdata. The youngest important snapshots will be kept.
The number of normal and important snapshots are counted independently.
Default value is "10".
New in version 0.1.8.
TIMELINE_CREATE=boolean
Defines whether hourly snapshots should be created.
Together with the timeline cleanup algorithm this will create a collection of snapshots with more snapshots is the near past and less snapshots in the far past.
Default value is "no".
TIMELINE_CLEANUP=boolean
Defines whether the timeline cleanup algorithm should be run for the config.
Default value is "no".
TIMELINE_MIN_AGE=seconds
Minimal age for snapshots to be deleted by the timeline cleanup algorithm.
Default value is "3600".
TIMELINE_LIMIT_HOURLY=number or
range
Defines how many hourly snapshots the timeline cleanup algorithm should keep. An hourly snapshot is the first snapshot in an hour. The youngest hourly snapshots will be kept.
Default value is "10".
TIMELINE_LIMIT_DAILY=number or
range
Defines how many daily snapshots the timeline cleanup algorithm should keep. A daily snapshot is the first snapshot in a day. The youngest daily snapshots will be kept.
Default value is "10".
TIMELINE_LIMIT_WEEKLY=number or
range
Defines how many weekly snapshots the timeline cleanup algorithm should keep. A weekly snapshot is the first snapshot in a week. The youngest weekly snapshots will be kept. In compliance with ISO 8601 weeks start on Monday.
Default value is "0".
TIMELINE_LIMIT_MONTHLY=number or
range
Defines how many monthly snapshots the timeline cleanup algorithm should keep. A monthly snapshot is the first snapshot in a month. The youngest monthly snapshots will be kept.
Default value is "10".
TIMELINE_LIMIT_QUARTERLY=number or
range
Defines how many quarterly snapshots the timeline cleanup algorithm should keep. A quarterly snapshot is the first snapshot in a quarter. The youngest quarterly snapshots will be kept.
Default value is "0".
TIMELINE_LIMIT_YEARLY=number or
range
Defines how many yearly snapshots the timeline cleanup algorithm should keep. A yearly snapshot is the first snapshot in a year. The youngest yearly snapshots will be kept.
Default value is "10".
EMPTY_PRE_POST_CLEANUP=boolean
Defines whether the empty-pre-post cleanup algorithm should be run for the config.
Default value is "no".
EMPTY_PRE_POST_MIN_AGE=seconds
Minimal age for snapshots to be deleted by the empty-pre-post cleanup algorithm.
Default value is "3600".
Some of the types used for the variables deserve an explanation.
A range of numbers given as
min-value-max-value,
e.g. "10-20".
A btrfs qgroup in the standard form
level-id,
e.g. "1/0".