How do I migrate data between Synology NAS via Migration ...
https://kb.synology.com/en-us/DSM/tutorial/How_to_migrate_between...01.12.2021 · The DSM version on the source device must be DSM 6.0 or above. If you wish to maintain your DSM versions on 6.0, 6.1, or 6.2 versions, we recommend updating to DSM 6.0.3, 6.1.7, or 6.2.4, respectively. If the source device has set up High Availability cluster, SSD cache, MailPlus cluster, or Time Backup, remove them first. On the destination ...