The backup-db.sh script should be easily configurable

[jmteufel]

The script for the database backups can be improved: https://github.com/bitwarden/server/blob/main/util/MsSql/backup-db.sh

The deletion section incorrectly states that files older than 30 days are deleted, when in fact the age for them to be deleted is 32 days.

The retention time should be configurable by setting a environment variable in a docker-compose.override.yml or a value in ./bwdata/config.yml.

Build Version

2025.12

Environment

Self-Hosted

Issue Tracking Info

• I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.

[bitwarden-bot]

Thank you for reporting this issue! We've added this to our internal tracking system.
ID: PM-36558
Link (for internal use): https://bitwarden.atlassian.net/browse/PM-36558