Add functionality base backup
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1 changed files with 50 additions and 39 deletions
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@ -1,15 +1,17 @@
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#!/bin/bash
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# Create archived backups of zfs datasets, with support for incremental backups from automated snapshots.
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# Usage: backup-zfs-dataset [OPTIONS] <dataset> <destination>
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# Create archived backups of zfs datasets
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# Usage: backup-zfs-dataset [OPTIONS] [<dataset> <destination>]
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usage() {
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>&2 printf "Usage: %s [OPTIONS] [<dataset> <destination>]\n" "$0"
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>&2 printf "Options:\n"
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>&2 printf "\t-c --compression-level <level> \t Specify compression level (integer)\n"
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>&2 printf "\t-s --dataset <dataset name> \t Specify dataset name\n"
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>&2 printf "\t-d --destination <path to directory> \t Specify destination\n"
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>&2 printf "\t-b --base \t Create a new base\n"
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>&2 printf "\t-i --incremental \t (Default) Create a new incremental backup\n"
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>&2 printf "\t-c --compression-level <level> \t Specify compression level (integer)\n"
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>&2 printf "\t-m --max-size <size> \t Specify maximum size of archive parts\n"
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>&2 printf "\t-f --force \t Force overwriting existing backups if the backup already exists\n"
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>&2 printf "\t-t --tag <tag> \t Provide a name to tag the archive\n"
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exit "${1:-1}"
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}
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@ -17,14 +19,6 @@ usage() {
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while [[ $# -gt 0 ]]; do
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case "${1}" in
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-c | --compression_level)
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if ! [[ "${2}" =~ [[:digit:]] ]]; then
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>&2 printf "Error: Invalid compression level: '%s'\n" "${2}"
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usage
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fi
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compression_level="${2}"
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shift 2
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;;
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-s | --dataset)
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if ! [ -n "${2}" ]; then
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>&2 printf "Error: Invalid dataset: '%s'\n" "${2}"
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@ -41,6 +35,28 @@ while [[ $# -gt 0 ]]; do
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destination="${2}"
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shift 2
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;;
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-b | --base)
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if [ "${create_base:=1}" -neq 1 ]; then
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>&2 printf "Error: Cannot create base backup when specifying differently.\n"
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usage
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fi
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shift 1
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;;
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-i | --incremental)
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if [ "${create_base:=0}" -neq 0 ]; then
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>&2 printf "Error: Cannot create incremental backup when specifying differently.\n"
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usage
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fi
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shift 1
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;;
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-c | --compression_level)
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if ! [[ "${2}" =~ [[:digit:]] ]]; then
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>&2 printf "Error: Invalid compression level: '%s'\n" "${2}"
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usage
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fi
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compression_level="${2}"
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shift 2
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;;
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-m | --max-size)
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if ! [[ "${2}" =~ [[:digit:]](K|M|G) ]]; then
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>&2 printf "Error: Invalid maximum size: '%s'\n" "${2}"
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@ -49,9 +65,9 @@ while [[ $# -gt 0 ]]; do
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max_size="${2}"
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shift 2
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;;
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-f | --force)
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force_create_manual_backup=1
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shift 1
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-t | --tag)
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tag="${2}-"
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shift 2
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;;
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*)
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>&2 printf "Error: Invalid option: '%s'\n" "${1}"
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@ -77,6 +93,23 @@ fi
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compression_level="${compression_level:=1}"
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max_size="${max_size:=2G}"
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# Check if you need to make a new base backup
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if [ "${create_base:=0}" -eq 1 ]; then
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snapshot_name="manual-$( date +%Y-%m-%d_%H-%M )"
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output_filename="${destination}/${tag:=}${snapshot_name}.gz"
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# Create ZFS snapshot
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printf "Creating snapshot\n"
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sudo zfs snapshot "${dataset}@${snapshot_name}"
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# Compress it
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printf "Backing up now\n"
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sudo zfs send --verbose "${dataset}@${snapshot_name}" \
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| gzip "-${compression_level}" --verbose --rsyncable \
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| split - --verbose -b "${max_size}" "${output_filename}.part."
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printf "Written base backup to: '%s'.\n" "${output_filename}"
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printf "Done!\n"
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exit 0
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fi
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# Working snapshots
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# Find snapshots
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@ -101,31 +134,9 @@ set -e
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# Backups
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# Base backup.
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output_filename="${destination}/${latest_manual}.gz"
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existing_backup="$( find "${destination}" -type f -name "${latest_manual}.gz.part.[a-z][a-z]" -print -quit )"
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if [ -z ${existing_backup} ]; then
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printf "Info: If you've manually created a new snapshot, you might want to remove the old backups.\n"
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printf "Latest manual snapshot was not yet backed up, backing up now.\n"
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sudo zfs send --verbose "${dataset}@${latest_manual}" \
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| gzip "-${compression_level}" --verbose --rsyncable \
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| split - --verbose -b "${max_size}" "${output_filename}.part."
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printf "Written manual backup to: %s\n" "${output_filename}"
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elif [ "${force_create_manual_backup}" ]; then
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printf "Removing previous backup files.\n"
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find "${destination}" -type f -name "${latest_manual}.gz.part.[a-z][a-z]" -print -delete
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printf "Backing up manual snapshot.\n"
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sudo zfs send --verbose "${dataset}@${latest_manual}" \
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| gzip "-${compression_level}" --verbose --rsyncable \
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| split - --verbose -b "${max_size}" "${output_filename}.part."
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printf "Written manual backup to: %s\n" "${output_filename}"
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else
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printf "Found existing backup of manual snapshot: %s\n" "${existing_backup}"
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fi
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# Incremental incremental backup.
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printf "Creating incremental backup between %s and %s\n" "${latest_manual}" "${latest_auto}"
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output_filename="${destination}/${latest_manual}-${latest_auto}.gz"
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output_filename="${destination}/${tag}${latest_manual}-${latest_auto}.gz"
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sudo zfs send --verbose -i "@${latest_manual}" "${dataset}@${latest_auto}" \
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| gzip "-${compression_level}" --verbose \
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| split - --verbose -b "${max_size}" "${output_filename}.part."
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