Vidjil backup

Storage directory structure: - keep the Vidjil structure - backup the data directory, including fastq files, analyses, and .vidjil files - check old backups to make sure there's only one backup storage

Files before 2020: - store in external hard drives - no need to store raw data from sequencer if not analyzed by Vidjil

Backup policy: - use external hard drives, preferably with 5TB each or more - backup Vidjil's data dir - backup Vidjil's mysql dump - code is backed up by git