All libre.moe services are backed up automatically. While I cannot garantuee you, that no data will ever be lost, I can garantuee there are highly effective backup policies in use.
Important data on libre.moe usually follows a very advanced backup strategy, The security and safety concept for this is outlined in the privacy policy (German only).
Production systems use highly redundant storage in the same datacenter as the servers itself. Application data either lives on block or object storage, both highly available and redundant. This ensures that production is unlikely to ever lose integrity due to a hardware failure.
In case of human or software error, natural desasters or other reasons that result in production data becoming corrupted unuseable, all data can be restored from backups.
This is the policy for most services on libre.moe, a trifecta of three storage system in three countries (Germany, Netherlands and France) for enabling high data durability, minimizing data loss in cases of needed recovery and protecting against desasters at a cost-effective level.
Daily backups keep a full history of all changes of application data including deleted files for up to 30 days. Databases are exported atomically and versioned in the same way.
This backup is hosted on Backblaze B2 in the Netherlands on highly redundant object storage.
In the unlikely case that all production servers experience complete data loss, the entire libre.moe suite can be brought back with a maximum loss of 24h worth of data - from the state of any day in the last 30 days.
These backups are 1:1 mirrors of all files and folders that the applications have in their file system - updated weekly onto cloud object-storage from a different provider in a geographically different location.
These backups are stored with Scaleway in an underground fallout shelter 25m under Paris and are meant as an insurance, keeping a relatively up to date mirror of all important data in case the daily backups didn't work or aren't accessable. This storage is on a Glacier-tier, meaning there is a waiting time of up to a few days before data can be read from this storage.
These backups are full copies of all databases, application data and server configuration. Every quarter (or so) a manual backup is performed, writing all data a physical backup HDD with versioning.
Two older versioned are kept, ensuring that two other copies exists while the other is replaced. This also allows for up to 9 months of history.
These backups are located in Germany, are not made automatically are kept put offline and air-gapped once complete, protecting against any kind of ransomware or remote hacking.