rsync Archive With FAT Device

.rsync Archive With FAT Device.md

rsync Archive With FAT Device

rsync Man Page:

-a, --archive               archive mode; same as -rlptgoD (no -H)
-r, --recursive             recurse into directories
-l, --links                 copy symlinks as symlinks
-p, --perms                 preserve permissions
-t, --times                 preserve times
-g, --group                 preserve group
-o, --owner                 preserve owner (super-user only)
-D                          same as --devices --specials

Unnecessary

• Since FAT doesn't have links, -l won't have any effect
• Since FAT doesn't have permissions or ownership, -p, -g, and -o won't have any effect
• Since FAT doesn't have modification times, -t won't have any effect
• Since FAT doesn't have specials devices, -D won't have any effect

Absolutely Necessary

--modify-window=NUM     compare mod-times with reduced accuracy

• --modify-window necessary because of nuances with FAT timestamps; all files will probably be transfered without this option

Optional

-c, --checksum              skip based on checksum, not mod-time & size

• the default algorithm of using mod-time and size to check whether a file needs to be transfered will be replaced by a checksum algorithm

Nice To Have

--delete                    delete extraneous files from dest dirs
--stats                     give some file-transfer stats
--progress                  show progress during transfer
-i, --itemize-changes       output a change-summary for all updates

rsync_from_ext4_to_fat.sh

rsync -avc --modify-window 1 --delete --stats --progress --itemize-changes ${SOURCE}/ ${DESTINATION}

rsync_from_fat_to_ext4.sh

rsync -rtvD --modify-window 1 --delete --stats --progress ${SOURCE}/ ${DESTINATION}/