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#! /bin/bash

# archive mode, be verbose, use compression, preserve partial files, display progress
rsync -avvzhxP /source /destination/

# turn off compression for local transfers (more for network/internet)

# remote
rsync -avzPe "ssh -i ssh-priv.key" user@server:/data/dir destination/

# options
--ignore-existing # only copy if file doesnt exist yet (filename)
--update # only copy if local file is newer (filedate)
--remove-source-files # move files to remote


rsync -aH -e ssh --delete --exclude Cache --link-dest=yesterdaystargetdir remote1:sourcedir todaystargetdir



-a archive = -rlptgoD
 -r recurse into dirs
 -l cp symlinks as symlinks
 -p preserve permissions
 -t prsv. times
 -g prsv. groups
 -o prsv. owner
 -D prsv. device and special files

-h human readable

-q quiet

-u update = skip files that are newer on the receiver
-H prsv. hard-links

-n dry run

—delete delete files from receiver if missing in src

—exclude=dir
—partial keep partially transf. files
-P = —partial und —progress

—link-dest=dir link to previous increment

--log-file=

# usually rsync checks file size and time as heuristic
--ignore-times # ignores size and time, thus transfers all files unconditionally (either delta or --whole-file)
--checksum # only examines size, if size is equal md5 checksum is compared (read whole files)
--checksum
--stats # show stats summary at the end


# Playing with compression
# - Compression over local network (wifi or ethernet) will probably not increase performance! 
#   https://unix.stackexchange.com/a/292020
# - For a very large amount of small files you might want to consider bundling them (tar) before sending (be careful, a lot of rsync features will not work this way!)
#   https://bash-prompt.net/guides/bash-rsync-speedup/
#   https://unix.stackexchange.com/questions/30953/tar-rsync-untar-any-speed-benefit-over-just-rsync
# - Using ssh rather than samba might also be faster!