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Full Discussion: Incremental backups with ZFS
Operating Systems Solaris Incremental backups with ZFS Post 302389225 by incredible on Saturday 23rd of January 2010 09:56:44 AM
Old 01-23-2010
Using ZFS snapshots is a quick and easy way to backup user home directories. For example, the following syntax creates recursive snapshots of all home directories in the tank/home file system.
# zfs snapshot -r tank/home@monday
You can create rolling snapshots to help manage snapshot copies.
You can use the zfs send and zfs receive commands to archive snapshots to more permanent storage.
You can create an incremental snapshot stream (see "zfs send -i" syntax).
The zfs send and receive commands are not enterprise-backup solutions. The receive operation is an all-or-nothing event, you can get all of a snapshot or none of it.
If you store the output of zfs send on a file or on tape, and that file becomes corrupted, then it will not be possible to receive correctly and none of the data will be recoverable.Enterprise backup solutions, as well as other copying methods, such as cp, tar, rsync, pax, cpio, and so on, are more appropriate for backup/restore than zfs send/receive.
 

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LN(1)								   User Commands							     LN(1)

NAME
ln - make links between files SYNOPSIS
ln [OPTION]... [-T] TARGET LINK_NAME (1st form) ln [OPTION]... TARGET (2nd form) ln [OPTION]... TARGET... DIRECTORY (3rd form) ln [OPTION]... -t DIRECTORY TARGET... (4th form) DESCRIPTION
In the 1st form, create a link to TARGET with the name LINK_NAME. In the 2nd form, create a link to TARGET in the current directory. In the 3rd and 4th forms, create links to each TARGET in DIRECTORY. Create hard links by default, symbolic links with --symbolic. By default, each destination (name of new link) should not already exist. When creating hard links, each TARGET must exist. Symbolic links can hold arbitrary text; if later resolved, a relative link is interpreted in relation to its parent directory. Mandatory arguments to long options are mandatory for short options too. --backup[=CONTROL] make a backup of each existing destination file -b like --backup but does not accept an argument -d, -F, --directory allow the superuser to attempt to hard link directories (note: will probably fail due to system restrictions, even for the supe- ruser) -f, --force remove existing destination files -i, --interactive prompt whether to remove destinations -L, --logical dereference TARGETs that are symbolic links -n, --no-dereference treat LINK_NAME as a normal file if it is a symbolic link to a directory -P, --physical make hard links directly to symbolic links -r, --relative create symbolic links relative to link location -s, --symbolic make symbolic links instead of hard links -S, --suffix=SUFFIX override the usual backup suffix -t, --target-directory=DIRECTORY specify the DIRECTORY in which to create the links -T, --no-target-directory treat LINK_NAME as a normal file always -v, --verbose print name of each linked file --help display this help and exit --version output version information and exit The backup suffix is '~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX. The version control method may be selected via the --backup option or through the VERSION_CONTROL environment variable. Here are the values: none, off never make backups (even if --backup is given) numbered, t make numbered backups existing, nil numbered if numbered backups exist, simple otherwise simple, never always make simple backups Using -s ignores -L and -P. Otherwise, the last option specified controls behavior when a TARGET is a symbolic link, defaulting to -P. AUTHOR
Written by Mike Parker and David MacKenzie. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report ln translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
link(2), symlink(2) Full documentation at: <http://www.gnu.org/software/coreutils/ln> or available locally via: info '(coreutils) ln invocation' GNU coreutils 8.28 January 2018 LN(1)
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