It works well and saves a fair bit of space due to deduplication (which is filesystem-independent as it implements its own deduplication layer). It can get quit

It works well and saves a fair bit of space due to deduplication (which is filesystem-independent as it implements its own deduplication layer). It can get quite slow when backing up containers, e.g. a container with a 200GB root filesystem takes a bit more than 2 hours (PBS running in container on the same Proxmox host, backup from SAS array to single SATA drive). Backup of a group of 4 filesystems totalling 2.25TB containing mostly larger files (Peertube video storage, Nextcloud data directories and image archives) on the same installation takes about 4 hours so the time needed varies significantly with the characteristics of the data to be backup up.