Hi @TuxyLord, and welcome!
Searching the AUR, I found many Synology-related packages:
$ pamac search synology
synodl 0.3.1-1 AUR
Command-line client for Synology's DownloadStation
synochat 1.1.1.57-1 AUR
Synology Chat Client is the desktop client software of Synology Chat.
nzb-monkey v0.2.7-1 AUR
A Reference implementation of how to handle a NZBLNK-URI, with support for SABnzbd, NZBGet and Synology Download Station
electorrent-bin 2.7.2-1 AUR
A remote control client for µTorrent, qBittorrent, rTorrent, Transmission, Synology & Deluge
electorrent 2.7.2-1 AUR
A remote control client for µTorrent, qBittorrent, rTorrent, Transmission, Synology & Deluge
cloudstation-3.0 3111-1 AUR
Synology Cloud Station. This version is for DSM versions that only works with CloudStation 3.0 (DSM 4.2 on a DS209 for example)
synology-uploader-photos 5.0.4418-3 AUR
uploader photos for Photo Station on NAS synology
synology-note-station 2.2.1_553-1 AUR
Synology Note Station Client connects you with Note Station on your Synology NAS. You can manage all the notes/to-do list offline, right from your local computer.
synology-hyper-backup-explorer 2.2.2.0141-2 AUR
A desktop tool for browsing, decrypting, and extracting different versions of backup data in Hyper Backup repositories
synology-drive 3.0.2_12682-1 AUR
Drive for PC, the desktop utility of the DSM add-on package, Drive, allows you to sync and share files owned by you or shared by others between a centralized Synology NAS and multiple client computers.
synology-cloud-sync-decryption-tool 018-1 AUR
A desktop tool to decrypt data encrypted by Cloud Sync
synology-cloud-station-drive 4.3.3.4469-2 AUR
An application which sync files between your computers and Synology NAS
synology-cloud-station-backup 4469-1 AUR
A backup service that allows you to back up your files from multiple client computers to a centralized Synology NAS
synology-assistant 7.0.50029-1 AUR
Synology Assistant is a desktop utility that searches for Synology servers within the local area network. It allows you to search and connect to your Synology server or set up Wake on LAN (WOL).
However, I didn’t find something specific named “Active Backup”. Perhaps it’s part of the synology-cloud-station-drive package. You can install it to check with:
pamac build synology-cloud-station-drive
Really, really, really hope this helps!