NAS Backup solution?

Hi.

I've (fairly) recently become the proud owner of a Pi5 running Raspberry
Pi OS. Storage is a 250 Gig NVMe drive.

I also have a Synology NAS.

I'm looking for suggestions on software I can use to back up the Pi5 to
the NAS. I've seen conflicting suggestions on various sites, so thought I
would come to the fount of all knowledge that is Usenet.

Any suggestions gratefully received.
--
Brian Howlett
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I came home from work the other day and found that someone had
stolen all my furniture, and replaced it with exact replicas...