useage rsync [debian]

based on:
man rsync
http://www.tecmint.com/rsync-local-remote-file-synchronization-commands/
http://stackoverflow.com/questions/1602324/rsync-how-do-i-synchronize-in-both-directions
http://www.howtogeek.com/135533/how-to-use-rsync-to-backup-your-data-on-linux/

install rsync:
sudo apt-get install -y rsync

to install grsync (gui, graphical user interface for rsync):
sudo apt-get install -y grsync

useage rsync:
sync both sides without deleting(remove --dry-run if all works fine and you want to run it):
rsync -rtuv --dry-run /path/to/dir_a/* /path/to/dir_b/
rsync -rtuv --dry-run /path/to/dir_b/* /path/to/dir_a/

“newer” mode (-u or –update flag) plus -t (to copy file modified time), -r (for recursive folders), and -v (for verbose output to see what it is doing)

rsync two hard disks:
rsync -rtuv --dry-run /media/xxfreddyxx/usb_hard_disk1/* /media/xxfreddyxx/usb_hard_disk2/

rsync over ssh to pi:
rsync -rtuv -e "ssh -p 22" pi@192.168.1.xx:/home/pi/path/to/dir/ /home/xxfreddyxx/path/to/dir/
rsync -rtuv -e "ssh -i /home/thisuser/cron/thishost-rsync-key" pi@192.168.1.xx:/home/pi/path/to/dir/ /home/xxfreddyxx/path/to/dir/

rsync --dry-run --remove-source-files -zvh backup.tar /tmp/backups/
rsync -av --delete /Directory1/ /Directory2/
rsync -avzhe ssh pi@192.168.1.10:/root/install.log /tmp/
rsync -avzhe ssh --progress /home/rpmpkgs pi@192.168.1.10:/root/rpmpkgs
rsync -avze ssh --include 'R*' --exclude '*' pi@192.168.1.10:/var/lib/rpm/ /root/rpm

rsync with a server:
based on:
http://www.tecmint.com/sync-files-using-rsync-with-non-standard-ssh-port/
rsync -arvz -e 'ssh -p ' --progress --delete user@remote-server:/path/to/remote/folder /path/to/local/folder

--password-file #This may be useful when scripting rsync.

create a starter to sync between two hard disks [tested on ubuntu-mate,debian] (both must be mounted, press enter to run the second sync, remove the --dry-run from code to really do the job):
in mate rightclick on desktop and create a new starter
in debian write in terminal: gnome-desktop-item-edit ~/.local/share/applications --create-new
based on:
http://askubuntu.com/questions/46627/how-can-i-make-a-script-that-opens-terminal-windows-and-executes-commands-in-the
x-terminal-emulator -e 'bash -c "rsync -rtuv --dry-run /home/xxfreddyxx/.path_to/folder/* /media/xxfreddyxx/OTHER_HARD_DISK_ID/home/xxfreddyxx/.path_to/folder/; read; rsync -rtuv --dry-run /media/xxfreddyxx/OTHER_HARD_DISK_ID/home/xxfreddyxx/.path_to/folder/* /home/xxfreddyxx/.path_to/folder/; read"'

for incremental backups you might use:
-link-dest

        -v, --verbose               increase verbosity
            --info=FLAGS            fine-grained informational verbosity
            --debug=FLAGS           fine-grained debug verbosity
            --msgs2stderr           special output handling for debugging
        -q, --quiet                 suppress non-error messages
            --no-motd               suppress daemon-mode MOTD (see caveat)
        -c, --checksum              skip based on checksum, not mod-time & size
        -a, --archive               archive mode; equals -rlptgoD (no -H,-A,-X)
            --no-OPTION             turn off an implied OPTION (e.g. --no-D)
        -r, --recursive             recurse into directories
        -R, --relative              use relative path names
            --no-implied-dirs       don't send implied dirs with --relative
        -b, --backup                make backups (see --suffix & --backup-dir)
            --backup-dir=DIR        make backups into hierarchy based in DIR
            --suffix=SUFFIX         backup suffix (default ~ w/o --backup-dir)
        -u, --update                skip files that are newer on the receiver
            --inplace               update destination files in-place
            --append                append data onto shorter files
            --append-verify         --append w/old data in file checksum
        -d, --dirs                  transfer directories without recursing
        -l, --links                 copy symlinks as symlinks
        -L, --copy-links            transform symlink into referent file/dir
            --copy-unsafe-links     only "unsafe" symlinks are transformed
            --safe-links            ignore symlinks that point outside the tree
            --munge-links           munge symlinks to make them safer
        -k, --copy-dirlinks         transform symlink to dir into referent dir
        -K, --keep-dirlinks         treat symlinked dir on receiver as dir
        -H, --hard-links            preserve hard links
        -p, --perms                 preserve permissions
        -E, --executability         preserve executability
            --chmod=CHMOD           affect file and/or directory permissions
        -A, --acls                  preserve ACLs (implies -p)
        -X, --xattrs                preserve extended attributes
        -o, --owner                 preserve owner (super-user only)
        -g, --group                 preserve group
            --devices               preserve device files (super-user only)
            --specials              preserve special files
        -D                          same as --devices --specials
        -t, --times                 preserve modification times
        -O, --omit-dir-times        omit directories from --times
        -J, --omit-link-times       omit symlinks from --times
            --super                 receiver attempts super-user activities
            --fake-super            store/recover privileged attrs using xattrs
        -S, --sparse                handle sparse files efficiently
            --preallocate           allocate dest files before writing
        -n, --dry-run               perform a trial run with no changes made
        -W, --whole-file            copy files whole (w/o delta-xfer algorithm)
        -x, --one-file-system       don't cross filesystem boundaries
        -B, --block-size=SIZE       force a fixed checksum block-size
        -e, --rsh=COMMAND           specify the remote shell to use
            --rsync-path=PROGRAM    specify the rsync to run on remote machine
            --existing              skip creating new files on receiver
            --ignore-existing       skip updating files that exist on receiver
            --remove-source-files   sender removes synchronized files (non-dir)
            --del                   an alias for --delete-during
            --delete                delete extraneous files from dest dirs
            --delete-before         receiver deletes before xfer, not during
            --delete-during         receiver deletes during the transfer
            --delete-delay          find deletions during, delete after
            --delete-after          receiver deletes after transfer, not during
            --delete-excluded       also delete excluded files from dest dirs
            --ignore-missing-args   ignore missing source args without error
            --delete-missing-args   delete missing source args from destination
            --ignore-errors         delete even if there are I/O errors
            --force                 force deletion of dirs even if not empty
            --max-delete=NUM        don't delete more than NUM files
            --max-size=SIZE         don't transfer any file larger than SIZE
            --min-size=SIZE         don't transfer any file smaller than SIZE
            --partial               keep partially transferred files
            --partial-dir=DIR       put a partially transferred file into DIR
            --delay-updates         put all updated files into place at end
        -m, --prune-empty-dirs      prune empty directory chains from file-list
            --numeric-ids           don't map uid/gid values by user/group name
            --usermap=STRING        custom username mapping
            --groupmap=STRING       custom groupname mapping
            --chown=USER:GROUP      simple username/groupname mapping
            --timeout=SECONDS       set I/O timeout in seconds
            --contimeout=SECONDS    set daemon connection timeout in seconds
        -I, --ignore-times          don't skip files that match size and time
            --size-only             skip files that match in size
            --modify-window=NUM     compare mod-times with reduced accuracy
        -T, --temp-dir=DIR          create temporary files in directory DIR
        -y, --fuzzy                 find similar file for basis if no dest file
            --compare-dest=DIR      also compare received files relative to DIR
            --copy-dest=DIR         ... and include copies of unchanged files
            --link-dest=DIR         hardlink to files in DIR when unchanged
        -z, --compress              compress file data during the transfer
            --compress-level=NUM    explicitly set compression level
            --skip-compress=LIST    skip compressing files with suffix in LIST
        -C, --cvs-exclude           auto-ignore files in the same way CVS does
        -f, --filter=RULE           add a file-filtering RULE
        -F                          same as --filter='dir-merge /.rsync-filter'
                                    repeated: --filter='- .rsync-filter'
            --exclude=PATTERN       exclude files matching PATTERN
            --exclude-from=FILE     read exclude patterns from FILE
            --include=PATTERN       don't exclude files matching PATTERN
            --include-from=FILE     read include patterns from FILE
            --files-from=FILE       read list of source-file names from FILE
        -0, --from0                 all *from/filter files are delimited by 0s
        -s, --protect-args          no space-splitting; wildcard chars only
            --address=ADDRESS       bind address for outgoing socket to daemon
            --port=PORT             specify double-colon alternate port number
            --sockopts=OPTIONS      specify custom TCP options
            --blocking-io           use blocking I/O for the remote shell
            --outbuf=N|L|B          set out buffering to None, Line, or Block
            --stats                 give some file-transfer stats
        -8, --8-bit-output          leave high-bit chars unescaped in output
        -h, --human-readable        output numbers in a human-readable format
            --progress              show progress during transfer
        -P                          same as --partial --progress
        -i, --itemize-changes       output a change-summary for all updates
        -M, --remote-option=OPTION  send OPTION to the remote side only
            --out-format=FORMAT     output updates using the specified FORMAT
            --log-file=FILE         log what we're doing to the specified FILE
            --log-file-format=FMT   log updates using the specified FMT
            --password-file=FILE    read daemon-access password from FILE
            --list-only             list the files instead of copying them
            --bwlimit=RATE          limit socket I/O bandwidth
            --write-batch=FILE      write a batched update to FILE
            --only-write-batch=FILE like --write-batch but w/o updating dest
            --read-batch=FILE       read a batched update from FILE
            --protocol=NUM          force an older protocol version to be used
            --iconv=CONVERT_SPEC    request charset conversion of filenames
            --checksum-seed=NUM     set block/file checksum seed (advanced)
        -4, --ipv4                  prefer IPv4
        -6, --ipv6                  prefer IPv6
            --version               print version number
       (-h) --help                  show this help (see below for -h comment)

       Rsync  can also be run as a daemon, in which case the following options
       are accepted:

            --daemon                run as an rsync daemon
            --address=ADDRESS       bind to the specified address
            --bwlimit=RATE          limit socket I/O bandwidth
            --config=FILE           specify alternate rsyncd.conf file
        -M, --dparam=OVERRIDE       override global daemon config parameter
            --no-detach             do not detach from the parent
            --port=PORT             listen on alternate port number
            --log-file=FILE         override the "log file" setting
            --log-file-format=FMT   override the "log format" setting
            --sockopts=OPTIONS      specify custom TCP options
        -v, --verbose               increase verbosity
        -4, --ipv4                  prefer IPv4
        -6, --ipv6                  prefer IPv6
            --log-file-format=FMT   log updates using the specified FMT
            --password-file=FILE    read daemon-access password from FILE
            --list-only             list the files instead of copying them
            --bwlimit=RATE          limit socket I/O bandwidth
            --write-batch=FILE      write a batched update to FILE
            --only-write-batch=FILE like --write-batch but w/o updating dest
            --read-batch=FILE       read a batched update from FILE
            --protocol=NUM          force an older protocol version to be used
            --iconv=CONVERT_SPEC    request charset conversion of filenames
            --checksum-seed=NUM     set block/file checksum seed (advanced)
        -4, --ipv4                  prefer IPv4
        -6, --ipv6                  prefer IPv6
            --version               print version number
       (-h) --help                  show this help (see below for -h comment)

       Rsync  can also be run as a daemon, in which case the following options
       are accepted:

            --daemon                run as an rsync daemon
            --address=ADDRESS       bind to the specified address
            --bwlimit=RATE          limit socket I/O bandwidth
            --config=FILE           specify alternate rsyncd.conf file
        -M, --dparam=OVERRIDE       override global daemon config parameter
            --no-detach             do not detach from the parent
            --port=PORT             listen on alternate port number
            --log-file=FILE         override the "log file" setting
            --log-file-format=FMT   override the "log format" setting
            --sockopts=OPTIONS      specify custom TCP options
        -v, --verbose               increase verbosity
        -4, --ipv4                  prefer IPv4
        -6, --ipv6                  prefer IPv6
        -h, --help                  show this help (if used after --daemon)
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