51 lines
1.9 KiB
Bash
Executable file
51 lines
1.9 KiB
Bash
Executable file
#!/bin/bash
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# Script for performing incremental backups using rsync.
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# Set the script to exit if any command returns a non-zero status.
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set -o errexit
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# Set the script to treat unset variables as errors.
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set -o nounset
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# Set the script to exit if a pipeline returns a non-zero status.
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set -o pipefail
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# Define the source directory you want to back up.
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readonly SOURCE_DIR="<input folder>"
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# Define the directory where the backups will be stored.
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readonly BACKUP_DIR="<output folder>"
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# Get the current date and time in the format 'YYYY-MM-DD_HH:MM:SS'.
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readonly DATETIME="$(date '+%Y-%m-%d_%H:%M:%S')"
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# Create a path for the current backup using the datetime.
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readonly BACKUP_PATH="${BACKUP_DIR}/${DATETIME}"
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# Create a symbolic link called 'latest' that points to the most recent backup.
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readonly LATEST_LINK="${BACKUP_DIR}/latest"
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# Ensure that the backup directory exists.
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mkdir -p "${BACKUP_DIR}"
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# Use rsync to perform the backup:
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# - 'ahv' preserves permissions, owner, group, and provides verbose output.
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# - '--progress' shows progress during transfer.
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# - '--stats' shows statistics at the end of the backup.
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# - '--delete' removes files from the backup that are no longer present in the source.
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# - '--log-file' specifies a log file for recording backup details.
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# - '--exclude' excludes the '.cache' directory from being backed up.
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# - '--link-dest' specifies a directory with previous backups, enabling hard-linking of unchanged files.
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# - "${SOURCE_DIR}/" is the source directory to be backed up.
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# - "${BACKUP_PATH}" is the destination directory for the current backup.
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rsync -ahv --progress --stats --delete \
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--log-file="${BACKUP_DIR}/${DATETIME}.log" \
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--exclude=".cache" \
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--link-dest "${LATEST_LINK}" \
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"${SOURCE_DIR}/" \
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"${BACKUP_PATH}"
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# Remove the symbolic link 'latest' to the old backup.
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rm -rfv "${LATEST_LINK}"
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# Create a new symbolic link 'latest' pointing to the most recent backup.
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ln -s "${BACKUP_PATH}" "${LATEST_LINK}"
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